Blood relation

	If A + B means A is the mother of B; A - B means A is the brother B; A % B means A is the father of B and A x B means A is the sister of B, which of the following shows that P is the maternal uncle of Q?
	A. Q - N + M x P B.    P + S x N - Q C.   P - M + N x Q D.   Q - S % P

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