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Shannon goes to the doctor complaining of symptoms of a sinus infection. She has frequent headaches around her eyes and complains of dizziness. Why would her doctor ask for details of her family medical history if Shannon believes she only has a sinus infection?

A: The family history may suggest another cause that should be investigated.
B: The family history may require other members of her family to be treated as well.
C: The family history is only for medical insurance issues.
D: The family history is gathered only when the problem has not been diagnosed.