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 Village Health Guide is for population of: 
Select and explain. 
A. 1000, B. 5000, C. 10000, D. 50000
A: 1000
Answer: A: 1000 
Explanation: 1000