A is father of X ; B is mother of Y. The sister of X and Z is Y. Wh

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A is father of X ; B is mother of Y. The sister of X and Z is Y. Which of the following statements is definitely not true ? 

A. B is the mother of Z.
B. X is the sister of Z
C. Y is the son of N.
D. B is the wife of A.

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