The options for the question - If A is the brother of B; B is the sister of C; and C is the father of D, how D is related to A?
D. Cannot be determined
The answer is to the question is 'Cannot be determined'
Explanation: If D is Male, the answer is Nephew. If D is Female, the answer is Niece. As the sex of D is not known, hence, the relation between D and A cannot be determined.