If M + N means M is the father of N, M - N means M is the daughter of N, and M × N means M is the son of N, what is the relationship of O if M + O - N?
In a class, there are three types of students: A, B, and C. Type A students are good at mathematics, Type B students are good at science, and Type C students are good at literature. If John is a Type A student and Sarah is a Type B student, which of the following statements is true?