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
One PHC covers how much population in hilly area? 
Select and explain. 
A. 10000, B. 20000, C. 30000, D. 50000
B: 20000
Answer: B: 20000 
Explanation: Ans. is 'b' i.e., 20000