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What is the correct answer?


 How is X related to Y?
   (I) Y says, "I have only one brother".
   (II) X says, "I have only one sister".

A. I alone is sufficient while II alone is not sufficient

B. II alone is sufficient while I alone is not sufficient

C. Either I or II is sufficient

D. Neither I nor II is sufficient

E. Both I and II are sufficient