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: Microbiology
[{'content': 'Best available option to prevent MRSA infection in a hospital: \nSelect and explain. \nA. Prophylactic antibiotics, B. Fumigation of wards, C. Proper hand washing, D. Use of disinfectants', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. is. c. Proper hand washing', 'role': 'assistant'}]