This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Impoant facts in Immunization, Newer Vaccines, Subject name: Social & Preventive Medicine
[{'content': 'Efficacy of Measles vaccine after second dose:- \nSelect and explain. \nA. 90%, B. 95%, C. 99%, D. 100%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Efficacy of Measles Vaccine:- >90% with 1 dose. >99% with 2 doses. (AMMRS Strategy)', 'role': 'assistant'}]