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': 'All are live vaccines except - \nSelect and explain. \nA. 17 - D, B. Rubella, C. Salk, D. Measles', 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Salk Salk vaccine is killed polio vaccine. 17 D is yellow fever live vaccine.", 'role': 'assistant'}]