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': 'Designated microscopy centre for TB under RNTCP is installed per \nSelect and explain. \nA. 50,000 population, B. 1,00,000 population, C. 20,000 population, D. 2,00,000 population', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Designated microscopy centre - 1 / 1,00,000 population and \nTuberculosis unit - 1 / 2,00,000 population and .', 'role': 'assistant'}]