If A + B means A is the brother of B, A - B means A is the sister of B, and A × B means A is the father of B, what is the relationship of C if A + C - B × D?
Answer: A. C is the sister of D
A + C means C is the brother of A. A - B means A is the sister of B. B × D means B is the father of D. Therefore, C is the sister of D.