Pointing to a lady a person said, "The son of her only brother is the brother of my wife." How is the lady related to the person?

A. Maternal aunt B. Grandmother
C. Sister of father-in-law D. None of these

• Brother of person's wife → brother-in-law of the person. Hence, the son of lady's brother is brother-in-law of the person.
  
  Therefore, the brother of the lady is the father-in-law of the person. Hence, the lady is the sister of the person's father-in-law.
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