This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Communicable diseases, Subject name: Social & Preventive Medicine
Commonest age group for diptheria is - 
Select and explain. 
A. 1-2 Years, B. 1-5 Years, C. 2-7 Years, D. 2-9 Years
B: 1-5 Years
Answer: B: 1-5 Years 
Explanation: Diphtheria paicularly affects children aged 1 to 5 yrs. In countries where widespread immunization practised, a shift in age incidence has been observed from preschool to school age. Ref:PARK&;S TEXTBOOK OF PREVENTIVE AND SOCIAL MEDICINE 23rd edition , Page :160