(i) There is a group of six persons A, B, C, D, E and F from a family. They are Psychologist, Manager, Lawyer, Jeweller, Doctor and Engineer.
(ii) The doctor is the grandfather of F who is a Psychologist.
(iii) The manager D is married to A.
(iv) C, the Jeweller is married to the Lawyer.
(v) B is the mother of F and E.
(vi) There are two married couples in the family.
What is the profession of A ?
Given F is a psychologist.
B is the mother of F and E is the brother or sister of F.
There are only two married couples in the family. Since, D is married to A, so C, the jeweller, who is married to a lawyer, will be married to B.
Again, the Manager D is married to A means A is the doctor and Grandfather of F and E.
Also, no one else is an Engineer. So, E must be an Engineer.
Clearly, A who is the grandfather of D is the doctor. Hence, the answer is (a)