D is married to F. B is the wife of Q. G is the daughter of A. F is the mother of Q. A is the sister of D. How is D related to B?​

Given:

D is married to F.

B is the wife of Q.

G is the daughter of A.

F is the mother of Q.

A is the sister of D.

So, D is husband's father of B.

Thus, correct option is (a).