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 develops an infection of methicillin-resistant Staphylococcus aureus. All of the following can be used to treat this infection except : \nSelect and explain. \nA. Cotrimoxazole, B. Cefaclor, C. Ciprofloxacin, D. Vancomycin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]