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': 'The following are live attenuated vaccines, except: \nSelect and explain. \nA. Oral polio, B. Yellow fever, C. Measles, D. Influenza', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Influenza', 'role': 'assistant'}]