Introducing a man, a woman said, “He is the only son of my mother’s mother.” How is the woman related to the man ?

The correct answer is C. Sister.

The woman’s mother’s mother is her grandmother. The man is the only son of her grandmother. This means that the man is the woman’s cousin. Cousins are siblings of one’s aunts or uncles. Therefore, the woman is the man’s sister.

The other options are incorrect because they do not accurately describe the relationship between the woman and the man.

• Option A is incorrect because the woman is not the man’s mother. The man’s mother is the woman’s grandmother.
• Option B is incorrect because the woman is not the man’s aunt. The man’s aunt is the woman’s mother.
• Option D is incorrect because the woman is not the man’s niece. The man’s niece is the woman’s daughter.
• Option E is incorrect because the woman is related to the man.