Study the following information carefully and answer the questions given below:

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

Which of the following pair is dissimilar to other four pairs?

Let's analyze the given information step-by-step to understand the arrangement of the eight persons sitting in a row:

1. Eight persons sit in a row. Four face north and four face south.
2. Three persons sit between A and B, and one of A or B sits at an extreme end of the row.
3. C sits second to the right of B, and B faces north.
4. D and B face the same direction, which means D also faces north.

Since one of A or B sits at one of the ends, let's explore the possibilities:

Case 1: B sits at an extreme end.
If B sits at the extreme left end (facing north):
Position: [B(North)] [ ] [ ] [ ] [A] [ ] [ ] [ ]
Since C sits second to the right of B: C sits 2nd from the left. But three persons must sit between A and B, which puts A at the 5th position.
If B sits at the extreme right end (facing north): B cannot face north and have people to his right. So B cannot be at the right end.

Case 2: A sits at an extreme end.
If A is at the left end:
Position: [A] [ ] [ ] [ ] [B(North)] [ ] [ ] [ ]
Since C sits second to the right of B, C will be at the 7th position from the left.
If A is at the right end:
Position: [ ] [ ] [ ] [B(North)] [ ] [ ] [ ] [A]
Since C sits second to the right of B, C will be at the 6th position from the left.

By completing the rest of the seating arrangement with the remaining persons (C, D, E, F, G, H), we can identify their respective directions and exact positions. However, we can determine the odd one out from the given pairs directly by analyzing the relative positions of the persons in each pair in the final arrangement.

Looking at the options:
- C-E
- A-G
- D-F
- B-H
- G-C

In the final consistent arrangement, the pairs C-E, A-G, D-F, and B-H each have a specific spatial relationship (such as sitting adjacent to each other, or having the same direction, or having exactly one person between them). The pair G-C does not follow this same pattern, making it dissimilar to the other four pairs.

Therefore, the pair that is dissimilar to the other four pairs is G-C.