This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Social & Preventive Medicine
For NRR to be 1 couple protection rate should be? 
Select and explain. 
A. 50%, B. 60%, C. 55%, D. 75%
B: 60%
Answer: B: 60% 
Explanation: Couple Protection Rate (CPR) is an indicator of the prevalence of contraceptive practice in the community the percentage of eligible couples effectively protected against childbih by one or the other approved methods of family planning sterilization iud,condom, ocp NRR = 1 can be achieved only if the CPR > 60% ref : park text book 21st ed