In a family of six members A, B, C, D, E, and F, there are two males and four females. A is a teacher, B is a doctor, C is the sister of D, D is the father of E, and F is the mother of A. Who is the male member in the family?

C. D

Five people are standing in a line: P, Q, R, S, and T. R is to the left of S but to the right of Q. T is not at either end. Who is standing at the rightmost position?

D. S

In a group of four people: X, Y, Z, and W, X is taller than Y but shorter than Z. W is shorter than X. Who is the tallest among them?

C. Z

Four friends, A, B, C, and D, are sitting in a row. A is to the left of B but to the right of C. D is not at either end. Who is sitting in the middle?

A. A

In a family of six members A, B, C, D, E, and F, there are two males and four females. A is a teacher, B is a doctor, C is the sister of D, D is the brother of E, and F is the mother of A. Who among the following is a male?

B. B