A Patient Has a Sore Throat with Fever

A patient has a sore throat with fever.The primary care NP observes erythematous 4+ tonsils with white exudate.A rapid antigen strep test is negative,and a culture is pending.The NP orders amoxicillin as empiric treatment.The patient calls the next day to report a rash.The NP should suspect:

A) penicillin drug allergy.
B) a viral cause for the patient's symptoms.
C) a serum sickness reaction to the penicillin.
D) scarlatiniform rash from the streptococcal infection.