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 caters the population of: \nSelect and explain. \nA. 5000, B. 10,000, C. 500,000, D. 1 lac', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 5000', 'role': 'assistant'}]