Five books are arranged on a shelf: P, Q, R, S, and T. R is to the left of Q but to the right of P. S is to the right of T. Which book is at the extreme right?

D. S

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 at one end of the line. Who is standing at the other end?

B. Q

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

Five students - A, B, C, D, and E - scored different marks in an exam. A scored more than B but less than C. D scored the highest, and E scored less than A. Who scored the second highest?

C. C

Four friends, A, B, C, and D, are sitting in a row. A is not next to B. C is sitting next to D. Who is sitting in the middle?

C. C