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': 'The antibacterial agent which can be used intranasally as the prophylaxis against recurrent S.aureus infection is: \nSelect and explain. \nA. Cefazolin, B. Mupirocin, C. Gentamicin, D. Moxifloxacin', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Mupirocin is a simple agent which can be used intranasally as prophylaxis against S.aureus. Ref: Harrisons Edition-18, Page : 1148, Table-133/9.', 'role': 'assistant'}]