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': 'Drug of choice for MRSA : \nSelect and explain. \nA. Vancomycin, B. Metronidazole, C. Imipenem, D. Clindamycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The current drug of choice for serious infections with MRSA remains vancomycin at most institutions\' "Vancomycin in a dose of 15 mg/kg to a maximum of LGM, given twice a day, is the drug of choice for MRSA. Teicoplanin in a dose of 400 mg/day in a single dose is equally effective”', 'role': 'assistant'}]