This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Rural & Urban Health Centres, Workers, Norms, Subject name: Social & Preventive Medicine
[{'content': 'Population covered under one Community Development Block is: \nSelect and explain. \nA. 10,000, B. 30,000, C. 50,000, D. 100,000', 'role': 'user'}, {'content': 'Answer: D \nExplanation: One Community Development Block (ICDS) comprises of: Rural/Urban areas: 100,000 population (100 villages). Tribal areas: 35,000 population (550 villages).', 'role': 'assistant'}]