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': 'In RNTCP, One tubercular unit covers how much population ? \nSelect and explain. \nA. 100000, B. 500000, C. 30000, D. 1000', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ans. b. 500000', 'role': 'assistant'}]