Q. You are working in the primary care clinic. A 14 year-old patient presents with profound throat pain with swallowing. On ENT exam, you visualize that she has red, swollen tonsils with whitish plaques and petechiae on the upper palate and you palpate that she has enlarged lymph nodes in the neck. You suspect she has group A Streptococcus (group A strep), "strep throat". You swab for a culture. You plan to give her penicillin as a treatment but on her history you see that she has a history of penicillin anaphylaxis. Which of the following would be the best alternative treatment?