Introducing a boy, I said, "His mother is the only daughter of my mother in law". How am I related to the boy?
Only daughter of mother in law is wife.
According to the question,
Boy's mother is the only daughter of the person's mother in law.
$$\Rightarrow$$Â Boy's mother is the wife of the person.
$$\therefore\ $$The person is the father of the boy.
Hence, the correct answer is Option B
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