In a family, there are three children: X, Y, and Z. X is the brother of Y, and Y is the sister of Z.

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A. Z is X's sister

B. Z is X's brother

C. Z is X's cousin

D. Z is X's parent

E. None of the above

Answer: A. Z is X's sister

Since Y is the sister of Z and X is the brother of Y, Z must be X's sister.

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