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
One PHC is established per ____________ population in Tribal areas 
Select and explain. 
A. 5000, B. 3000, C. 30000, D. 20000
D: 20000
Answer: D: 20000 
Explanation: Population norms for health centres in india Primary health care system ICDS system Centre Sub- centre PHC CHC Anganwadi Level of care Primary Primary Secondary - Population norm Plains Hilly/tribal areas 5000 3000 30,000 20,000 1,20,000 80,000 400-800 300-800