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 the son of P, S is the daughter of Q, and T is the sister of R. Who is U?
In a group of five friends: Alice, Bob, Charlie, David, and Eva, Alice is taller than Bob but shorter than Charlie. David is shorter than Eva but taller than Bob. Who is the tallest among them?
A set of animals includes a dog, a cat, a rabbit, and a parrot. The dog is a mammal, the cat is a mammal, the rabbit is a mammal, and the parrot is a bird. Which of the following is true?