This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General, Subject name: Microbiology
[{'content': 'Most effective way of preventing hospital infection is: \nSelect and explain. \nA. Fumigation, B. Sterilization, C. Hand washing, D. Early diagnosis and treatment', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Ans. C. Hand washingHand of healthcare personnel ae the most important reservoir for transmission of healthcare associated infections', 'role': 'assistant'}]