Read the given information carefully and answer the questions based on it:

Eight persons sit in a row. Four persons face north and rest face south. Three persons sit between A and B and one of them sits at the end of the row. C sits second to the right of B who faces north. D and B face same direction but they do not sit adjacent to each other. E sits third to the left of D and faces opposite direction to D. G sits third to the right of C. Both the immediate neighbors of G face same direction. H sits to the right of F.

Who among the following sits just right of B?

To find out who sits just to the right of B, we can break down the puzzle step-by-step based on the given rules:

1. Total Persons and Directions: There are 8 persons sitting in a row. 4 face North and 4 face South.
Let us represent the 8 positions in the row from 1 to 8 (from left to right).

2. Positions of A and B: There are 3 persons sitting between A and B, and one of them sits at the extreme end of the row.
This means the distance between A and B is 4 units (i.e., if B is at index 1, A is at index 5).
Since one of them sits at the end of the row, we have two primary cases:
Case I: B is at one of the ends (say, position 1 or 8). Since B faces North and C sits second to the right of B, B cannot be at position 8 (as there would be no position to his right). Thus, if B is at the end, B must be at position 1. Then, C (second to the right of B) sits at position 3, and A sits at position 5 (with 3 persons between A and B: positions 2, 3, and 4).
Case II: A is at one of the ends (position 1 or 8). If A is at position 8, then B is at position 4. Since C is second to the right of B (who faces North), C is at position 6. If A is at position 1, B is at position 5, and C is at position 7.

3. Analyze G's position: G sits third to the right of C. Let's check our configurations:
- If B = 1, C = 3, then G (third to the right/left of C depending on C's direction): Since G must be within the 8 positions, if C faces North, third to the right of C is position 6. So G = 6. If C faces South, third to the right of C is to the left, which would be 0 (invalid). So C must face North and G = 6.
- If B = 4, C = 6, then if C faces South, third to the right of C is 6 - 3 = 3. So G = 3. (If C faces North, third to the right would be 9, invalid).
- If B = 5, C = 7, then if C faces South, third to the right of C is 7 - 3 = 4. So G = 4.

4. Analyze E and D: E sits third to the left of D. D and B face the same direction (North), but they do not sit adjacent to each other. Since D faces North, "third to the left of D" means E is 3 positions to the left of D (i.e., E = D - 3). D cannot be adjacent to B.
Let's test Case I: B = 1 (North), C = 3 (North), A = 5, G = 6.
Remaining positions for D: since D cannot be adjacent to B (D ≠ 2) and B=1, C=3, A=5, G=6 are occupied, D can be at 4, 7, or 8.
If D = 7 (North), then E (third to the left of D) = 4. This works! Let's check the remaining positions: 2, 8 are left for F and H.
If D = 7, E = 4. E faces the opposite direction to D, so E faces South.
We have G at 6. Both immediate neighbors of G (which are A at 5 and D at 7) face the same direction. Since D faces North, A must also face North.
Now we have directions: B (North), C (North), A (North), D (North). That is 4 persons facing North. The remaining 4 must face South. So E, G, F, and H must face South.
We are told: "H sits to the right of F."
The remaining positions are 2 and 8. Since both F and H face South, "H sits to the right of F" means H is to the left of F in the row (since facing South reverses left/right relative to the row).
Thus, H must be at position 2 and F must be at position 8.
Let's verify this arrangement: 1: B (North), 2: H (South), 3: C (North), 4: E (South), 5: A (North), 6: G (South), 7: D (North), 8: F (South).
All conditions are perfectly satisfied:
- Four face North (B, C, A, D) and four face South (H, E, G, F).
- Three persons (H, C, E) sit between A (5) and B (1), and B is at the end.
- C (3) sits second to the right of B (1) who faces North.
- D (7) and B (1) face the same direction (North) and are not adjacent.
- E (4) sits third to the left of D (7) and faces South (opposite to D).
- G (6) sits third to the right of C (3) (C faces North).
- Both neighbors of G (A at 5 and D at 7) face North (same direction).
- H (2) sits to the right of F (8) (since F faces South, right of F is towards position 1, and H is at 2).

5. Conclusion: The person sitting just to the right of B (who is at position 1 facing North) is at position 2, which is H.

Therefore, the person who sits just right of B is H.