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': 'Population covered by a PHC in hilly region is ? \nSelect and explain. \nA. 20,000, B. 30,000, C. 40, D. 25,00', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., 20,000 o One PliC for every 30,000 rural population in the plains. o One PHC for every 20,000 population in hilly, tribal and backward areas.", 'role': 'assistant'}]