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': 'True regarding Leprosy \nSelect and explain. \nA. Any positive smear 1+ is MBL, B. MBL recommended treatment for 12 months duration, C. Grenz zone in Lepromatous spectrum, D. All deformity cases are MBL', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]