Number the five seats from left to right because everyone faces North. Place Tarun at seat 1 from the extreme-left clue. Uma is second to the right of Tarun, so Uma must occupy seat 3. Pooja is immediately left of Uma, fixing Pooja at seat 2. Place Ravi at extreme-right seat 5; consequently Sana, immediately left of Ravi, occupies seat 4. The completed arrangement is Seat 1: Tarun | Seat 2: Pooja | Seat 3: Uma | Seat 4: Sana | Seat 5: Ravi. The question asks: Who sits at the extreme right? Tarun is incorrect because Tarun occupies seat 1, which does not satisfy the requested position. Pooja is incorrect because Pooja occupies seat 2, which does not satisfy the requested position. Uma is incorrect because Uma occupies seat 3, which does not satisfy the requested position.