In such type of questions, a few essential criteria for selection of a group of items are given. The candidate has to keep these conditions in mind and make the required selection as per the directions given in each question.

There are five men A, B, C, D and E and six women P, Q, R, S, T and U, A, B and R advocates;
C, D, P, Q and S are doctors and the rest are teachers. Some terms are to be selected from amongst these eleven persons subject to the following condition :
A, P and U have to be together.
B cannot go with D or R.
E and Q have to be together.
C and T have to be together.
D and P cannot go together.
C cannot go with Q.

If the term is to consists of two advocates, two doctors, two teachers and not more than three ladies, the members of the team are :

A. A B C P T U
B. A C P R T U
C. A E P Q R T
D. B C E Q R T
Answer: A . A B C P T U


A C P R T U and A E P Q R T are wrong because each of these combination consists of four ladies. B C E Q R T is incorrect because B and R cannot go together.