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: Unknown
[{'content': 'Which of the following drug is not used for Methicillin Resistant Staph. Aureus (MRSA).? \nSelect and explain. \nA. Cefaclor, B. Cotrimoxazole, C. Ciprofloxacin, D. Vancomycin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans- A Cefaclor Drugs used for MRSA Vancomycin Chloramphenicol Linezolid Minocycline Quinupristin/ dalfopristin Trimethoprim - sulfamethoxazole Fluoroquinolones', 'role': 'assistant'}]