This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Virology, Subject name: Microbiology
[{'content': 'Which of the following is a killed vaccine \nSelect and explain. \nA. Hepatitis B, B. Measles, C. Yellow fever, D. Japanese encephalitis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Live vaccines - BCG,Ty 21a (typhoid), Sabin (polio), MMR,17D(yellow fever) and Japanese encephalitis vaccine. Killed vaccines - TAB (enteric fever), Cholera vaccine, Salk vaccine (polio) and Hepatitis B Ref: Baveja textbook of microbiology; 4th edition', 'role': 'assistant'}]