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': 'Live vaccines are - \nSelect and explain. \nA. TT, B. BCG, C. DPT, D. All', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is 'b' i.e., BCG", 'role': 'assistant'}]