Pointing to a boy in the photograph Reena said, "He is the only son of the only child of my grandfather." How Reena is related to that boy?

A. Mother B. Sister
C. Aunt D. Cannot be determined

• Ans:B
  
  The boy in the photograph is the only son of Reena's grandfather's only son; i.e., the boy is the only son of Reena's father.
  Hence, the boy is the brother of Reena or Reena is the sister of the boy.
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