Pointing towards a girl, Chetan(male) said "She is the daughter of the only child of my grandmother". How is Chetan related to that girl?
Only child of Chetan's grandmother is Chetan's father/mother.
Now, that girl is Chetan's father's/mother's daughter, thus Chetan and the girl are siblings.
Thus, Chetan is her brother.
=> Ans - (C)
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