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 Lyophilized vaccines except \nSelect and explain. \nA. BCG, B. Yellow fever, C. Measeles, D. Tetanus', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]