This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Epidemiology, Subject name: Social & Preventive Medicine
The most effective vaccine is - 
Select and explain. 
A. TT, B. OPV, C. B.C.G, D. Measles
D: Measles
Answer: D: Measles 
Explanation: .most effective vaccine is the live attenuated vaccines for measles.it is presented as afreeze dried product.0.5 ml contains more than 1000 vral infective units of the vaccine strain.uually given after 9 months of age along with vit A prophylaxis as per national immunisation schedule. ref:park&;s textbook,ed 22,pg no 140