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: Social & Preventive Medicine
[{'content': 'As per the school health committee recommendation, medical examination of school children should be done every: March 2009 \nSelect and explain. \nA. 1 year, B. 2 year, C. 3 year, D. 4 year', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. D: 4 year As per the school health committee recommendation, medical examination of school children should be done at the time of admission and thereafter every 4 years.', 'role': 'assistant'}]