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
Which type of vaccine is MMR 
Select and explain. 
A. Live attenuated, B. Killed, C. Toxoid, D. Subunit
A: Live attenuated
Answer: A: Live attenuated 
Explanation: . <p> MMR vaccine is a mixture of live attenuated strains of three viruses causing mumps,measles and rubella.Children should get 2 doses of MMR vaccine: First Dose: 12 to 15 months of age Second Dose: 4 to 6 years of age (may be given earlier, if at least 28 days after the 1st dose)</p><p>ref;park&;s textbook of preventive and social medicine,22 nd edition,pg no 137</p>