P and Q are M's parents. M and N are siblings. Q is N's mother. What is P to M?

  • A. Mother
  • B. Father
  • C. Sister
  • D. Brother

Explanation

P and Q are the two parents, and Q is identified as the mother, so P must be the father. M and N being siblings simply confirms that both children share the same pair of parents. Sister and brother describe the wrong generation entirely, since P is a parent.

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