This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Social & Preventive Medicine
[{'content': 'Which of the following is a Live vaccine - \nSelect and explain. \nA. Salk polio vaccine, B. HDCV, C. Hepatitis B vaccine, D. 17-D Vaccine', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., 17-D vaccine", 'role': 'assistant'}]