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: Microbiology
[{'content': 'Lepra bacilli can survive outside the human body up to: \nSelect and explain. \nA. 7 days, B. 12 days, C. Zero days, D. 5 days', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. is. 'b' i. e., 12 days", 'role': 'assistant'}]