There are five persons in a group — P , Q, R, S and T . The group has one doctor, one lawyer and one artist. P and S are unmarried students. T is a man married to one of the group members. Q is the brother of P and is neither doctor nor artist. R is not doctor.

Who is the doctor ?

The correct option is T.

Let us analyze the information given in the question step-by-step to determine who the doctor is:

1. We have a group of five persons: P, Q, R, S, and T.
2. The occupations present in the group are: one doctor, one lawyer, and one artist. The remaining two members are students.
3. We are given that P and S are unmarried students. Since P and S are students, they cannot be the doctor, lawyer, or artist.
4. We are given that Q is the brother of P and is neither a doctor nor an artist. Since Q is neither a doctor nor an artist, and the student positions are already taken by P and S, Q must be the lawyer.
5. We are given that R is not the doctor. Since R is not the doctor, and the lawyer is Q, and the students are P and S, R must be the artist.
6. Now, let's look at the remaining person, T. Since P and S are students, Q is the lawyer, and R is the artist, the only remaining occupation for T is the doctor.

Therefore, T is the doctor.