This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Sterilization and Disinfection, Subject name: Microbiology
[{'content': 'Simplest and most effective method to prevent nosocomial infection- \nSelect and explain. \nA. Use of antibiotics, B. Use of laminar airflow, C. Use of filters, D. Hand washing', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Hand washing o As hand contact is the most common mode of transmission, the best preventive measure of nosocomial infection is proper hand hygiene.", 'role': 'assistant'}]