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': 'There is an outbreak of MRSA infection in a ward. What is the best way to control the infection- \nSelect and explain. \nA. Vancomycin given emperically to all the patients, B. Fumigation of ward frequently, C. Washing hand before & after attending patient, D. Wearing mask before any invasive procedure in ICU', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]