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': 'One Anganwari worker is for population of: \nSelect and explain. \nA. 1000, B. 5000, C. 10000, D. 50000', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 1000', 'role': 'assistant'}]