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 sitting at one of the ends. What is the correct order from left to right?
In a family, there are four members: P, Q, R, and S. P is the father of Q, Q is the sister of R, and S is the mother of R. Who is the eldest member of the family?
Among four pets, a dog, a cat, a rabbit, and a turtle, the dog is heavier than the cat but lighter than the rabbit. The turtle is the lightest. Which pet is the heaviest?