A 21-year-old woman comes to the university health clinic ...

The correct answer is A. This patient has infectious mononucleosis caused by the Epstein-Barr virus. This disease can present in a very similar manner to infectious pharyngitis caused by the group A beta hemolytic streptococcus. These patients typically present with more mild symptoms of fever and sore throat and in many cases have splenomegaly. ................
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