In a coded relationship, if M ÷ N means M is the daughter of N, M + N means M is the son of N, and M × N means M is the wife of N, what is the relationship of O if M ÷ O + N?

Answer: A. O is the mother of M
M ÷ O means M is the daughter of O, and M + N means M is the son of N, so O is the mother of M.