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 lawyer ?

The correct option is Q.

Let us break down the information provided in the question step-by-step to determine the profession of each group member:
1. The group consists of five members: P, Q, R, S, and T.
2. Among them, there is exactly one doctor, one lawyer, and one artist. The remaining two members are students.
3. We are given that P and S are unmarried students. This accounts for both students in the group, meaning P and S cannot be the doctor, lawyer, or artist.
4. Since P and S are students, the three professions (doctor, lawyer, artist) must be shared among the remaining three members: Q, R, and T.

Now, let us determine who holds which profession among Q, R, and T:
1. We are told that Q is neither the doctor nor the artist. Since Q must have one of the three professions, and Q is not the doctor or the artist, Q must be the lawyer.
2. We are also given that R is not the doctor. Since Q is the lawyer and R is not the doctor, R must be the artist.
3. Consequently, the remaining profession, doctor, must belong to T.

Thus, by logical elimination, Q is the lawyer.