This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Classification, Coho Study, Subject name: Social & Preventive Medicine
[{'content': 'Measles shows age distribution. It is found most commonly in which age group? \nSelect and explain. \nA. 9 months to 3 years, B. 6 months to 2 years, C. 9 months to 2 years, D. 6 months to 3 years', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Impoant diseases & their age distribution: Measles - 6 months to 3 years Mumps - 5-9yrs Chicken pox - 5-9yrs Rheumatic fever - 5 to 15 years Cancers, Cataract - >50 years Rota virus - younger infants Diabetes , HTN, CHD - > 40yrs', 'role': 'assistant'}]