$A + B$ means $A$ is the son of $B$; $A - B$ means $A$ is the wife of $B$; $A \times B$ means $A$ is the brother of $B$; $A \div B$ means $A$ is the mother of $B$; and $A = B$ means $A$ is the sister of $B$. What does $P + R - Q$ mean?

  • A
    $Q$ is the father of $P$.
  • B
    $Q$ is the son of $P$.
  • C
    $Q$ is the uncle of $P$.
  • D
    $Q$ is the doctor of $P$.

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