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: Medicine
[{'content': 'Drug of choice in methicillin-resistant Staphylococcus aureus \nSelect and explain. \nA. Ceftriaxone, B. Ceftazidime, C. Ampicillin, D. Vancomycin', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]