Pointing to a photograph, a woman says, "He is the son of the only son of my grandfather." How is the man in the photograph related to the woman?

Answer: B. brother

Analyze from the end: "My grandfather's only son"
This is the woman's father (assuming the only son).
Continue the phrase: "Son of [my father]"
This is the woman's brother.
Conclusion: The man in the photograph is the woman's brother.

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