Explanation:

- Five persons are sitting in a row, all facing north. We have the introvert, extrovert, thin, intelligent, and weak persons.

- An introvert and an extrovert sit at the extreme ends.

- A thin person is immediately right of the intelligent person.

- A weak person sits immediately left of the extrovert.

- The intelligent person is exactly between the introvert and the thin person.

Let's analyze:

- The positions are: Introvert, Intelligent, Thin, Weak, Extrovert.

- The intelligent person will be in the middle.

- The arrangements fit the position of Extrovert as the weak person is left to the Extrovert, and the thin person is to the right of the intelligent person.

Thus, the Intelligent person is sitting at the center.

Correct Answer: Intelligent (Option 2)