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
Net reproductive rate=1 can be achieved if couple protection rate is more than: 
Select and explain. 
A. 40%, B. 50%, C. 60%, D. 70%
C: 60%
Answer: C: 60% 
Explanation: Demographic goal of Net reproductive rate=1 can be achieved if couple protection rate is more than 60%. Ref: Park, 22nd edition pg: 455