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
A trained bih attendant serves a population of: 
Select and explain. 
A. 500, B. 1000, C. 2500, D. 5000
B: 1000
Answer: B: 1000 
Explanation: Each trained bih attendant is meant to serve 1000 population. Ref: Textbook of community medicine, S. Lal, 3rd edition pg: 629.