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
True about mumps vaccine 
Select and explain. 
A. Killed vaccine, B. 95% efficacy, C. Only one dose is given, D. Not combined with any other vaccine
B: 95% efficacy
Answer: B: 95% efficacy 
Explanation: Widely used live attenuated mumps vaccines include the Jeryl-Lynn, RIT 4385, Leningrad-3, L-Zagreb and Urabe strains. A single dose(0.5ml) produces antibodies in 95% of vacinees. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 166