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': 'A subcentre in a hilly area caters to a population of: \nSelect and explain. \nA. 1000, B. 2000, C. 3000, D. 5000', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Subcentres are established on the following basis: One subcentre for every 5000 population is general. One subcentre for every 3000 population in hilly, tribal and backward areas. Ref:Parks Textbook of Preventive and Social Medicine By K.Park, 18th Edition, Page 696', 'role': 'assistant'}]