This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Immunity, Subject name: Microbiology
[{'content': 'AH are live vaccines except: \nSelect and explain. \nA. BCG, B. Salk vaccine, C. Measles, D. Mumps', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ref: A nanthanarayan, Paniker CJ. Textbook of microbiology. 8th Edition. London: John Wiley & Sons: 2009. Pg. 88. 451Explanation:Types of vaccines (See the following table)', 'role': 'assistant'}]