This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'A patient needs antibiotic treatment for an artificial valve, culture-positive infective enterococcal endocarditis. His medical history includes severe anaphylactic reaction to penicillin G during the past year. The best approach would be treated with : \nSelect and explain. \nA. Amoxicillin–clavulanic acid, B. Aztreonam, C. Cefazolin plus gentamicin, D. Vancomycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]