In a family, there are four members: John, Mary, Sam, and Lisa. John is a father, Mary is a mother, Sam is a son, and Lisa is a daughter. Which of the following pairs can be classified as parents?
Five books are arranged on a shelf. Book A is to the left of Book B, Book C is to the right of Book D, and Book E is to the left of Book A. What is the correct order of the books from left to right?