This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: National Immunization Schedule 2020-21, Subject name: Social & Preventive Medicine
[{'content': 'The strain used in Mumps vaccine is \nSelect and explain. \nA. Jeryl Lynn, B. Edmonston Zagreb, C. RA 27/3, D. Oka', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The various strains used for Mumps include Jeryl-Lynn, RIT-4385, Leningrad-3, L-Zagreb and Urabe strains.', 'role': 'assistant'}]