This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preventive Medicine in Obstetrics, Paediatrics & Geriatrics, Subject name: Social & Preventive Medicine
[{'content': 'Couple protection rate should be _____ to achieve Net Reproduction rate 1 \nSelect and explain. \nA. 40%, B. 50%, C. 60%, D. 70%', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Couple protection rate - is an indicator of prevalence of contraceptive practice in a community NRR = 1 can be achieved if CPR > 60% CPR (India): 54%', 'role': 'assistant'}]