This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cell Wall Synthesis Inhibitors, Subject name: Pharmacology
[{'content': 'A patient needs antibiotic treatment for aificial 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 treatment with: \nSelect and explain. \nA. Amoxicillin-clavulanic acid, B. Aztreonam, C. Cefazolin plus gentamicin, D. Vancomycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: * Severe allergy to penicillins rule out the use of amoxicillin and cefazolin. * Vancomycin is highly effective against MRSA and enterococcal infections. * Drugs for VRSA and VRE (Vancomycin Resistant Enterococcus faecalis) include linezolid and daptomycin.', 'role': 'assistant'}]