Directions: Study the following information carefully to answer the questions given below.

Seven researchers, A, B, C, D, E, F, and G, sit in a straight row facing north. Each of them specializes in a different academic field, namely Physics, Chemistry, Biology, History, Math, Geology, and Astronomy, but not necessarily in the same order.

One person sits between B and the astronomy specialist. B is the immediate neighbor of only the physics specialist. D sits third to the right of A. D does not specialize in either Astronomy or Physics. B and A do not sit next to each other. One person sits between D and the history specialist. The number of people sitting to the right of B is equal to the number of people sitting to the left of C. There are more than three people between the biology specialist and the chemistry specialist. F sits to the right of E and adjacent to the chemistry specialist. G sits next to the math specialist.

G specializes in which of the following subjects?

The correct option is History.

Step-by-Step Explanation:

Let us arrange the seven researchers (A, B, C, D, E, F, and G) in seven positions from left to right, numbered 1 to 7, all facing North.

Step 1: Determine the positions of B, C, and the Physics specialist
1. Clue: "B is the immediate neighbor of only the physics specialist."
Since B has only one immediate neighbor, B must sit at one of the extreme ends of the row (Position 1 or Position 7). The person sitting next to B is the Physics specialist.
2. Clue: "The number of people sitting to the right of B is equal to the number of people sitting to the left of C."
With B at Position 1 (having 6 people to B's right), C must be at Position 7 (having 6 people to C's left). Position 2 is occupied by the Physics specialist.

Step 2: Determine the positions of Astronomy, A, D, and History
1. Clue: "One person sits between B and the astronomy specialist."
Since B is at Position 1, the Astronomy specialist must sit at Position 3.
2. Clues: "D sits third to the right of A" and "B and A do not sit next to each other."
Since B is at Position 1, A cannot sit at Position 2. Placing A at Position 3 (making A the Astronomy specialist) puts D at Position 6 (3 + 3 = 6).
3. Clue: "One person sits between D and the history specialist."
Since D is at Position 6, the History specialist must sit at Position 4.

Step 3: Determine the positions of E, F, G, and their respective subjects
1. The remaining vacant positions for researchers E, F, and G are 2, 4, and 5.
2. Clue: "F sits to the right of E"
To satisfy this, E must be at Position 2 (Physics specialist) and F must be at Position 5.
This leaves G at Position 4 (History specialist).
3. Clue: "G sits next to the math specialist."
G sits at Position 4. Its neighbors are Position 3 (A - Astronomy) and Position 5 (F). Therefore, F at Position 5 must be the Math specialist.
4. Clue: "F sits adjacent to the chemistry specialist."
F (Position 5) is adjacent to Position 4 (History) and Position 6 (D). Thus, D at Position 6 must be the Chemistry specialist.
5. Clue: "There are more than three people between the biology specialist and the chemistry specialist."
With Chemistry at Position 6, Biology must be at Position 1 (B), giving exactly 4 people (Positions 2, 3, 4, 5) between them.
6. Finally, the remaining subject Geology belongs to C at Position 7.

Final Seating & Subject Arrangement:
- Position 1: B — Biology
- Position 2: E — Physics
- Position 3: A — Astronomy
- Position 4: G — History
- Position 5: F — Math
- Position 6: D — Chemistry
- Position 7: C — Geology

Hence, G specializes in History.