In a family of six members P, Q, R, S, T, and U, there are two males and four females. P is a teacher, Q is a doctor, R is T's mother, S is U's sister, and T is a student. Who is the male member of the family?
Four friends, A, B, C, and D, have different pets: a dog, a cat, a bird, and a fish. A does not have a dog. B has a cat. C does not have a bird. Who has the fish?