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
Measles shows age distribution. It is found most commonly in which age group? 
Select and explain. 
A. 9 months to 3 years, B. 6 months to 2 years, C. 9 months to 2 years, D. 6 months to 3 years
D: 6 months to 3 years
Answer: D: 6 months to 3 years 
Explanation: 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