In a family, there are four members: W, X, Y, and Z. W is the grandmother of Z, X is the father of Y, and Y is the daughter of Z. Who is the mother of Y?

C. Z

If N is the sister of O, and O is the father of P, what is the relationship of P to N?

D. NEPHEW

What is the 10th letter in the English alphabet?

A. J

In the sequence A, B, C, D, E, F, G, H, I, J, which letter is in the 15th position?

A. O

Choose the odd letter group: ACD, BDF, CEG, DHI, EJK

D. EJK