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': 'Each primary health centre is meant to serve a population of: \nSelect and explain. \nA. 1000, B. 5000, C. 10000, D. 30000', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Each PHC is meant to serve 30000 population in rural area in plains, while it serves 20000 population in hilly, tribal and backward areas. Ref: Park 22nd edition pg: 845.', 'role': 'assistant'}]