This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
[{'content': 'To achieve Net reproduction rate (NRR) of 1, couple protection rate should be - \nSelect and explain. \nA. <50%, B. 50%, C. 55%, D. 60%', 'role': 'user'}, {'content': "Answer: D \nExplanation: - couple protection rate is an indicator of the prevalence of contraceptive practice in the community. - CPR is defined as the percent of eligible couples effectively protected against child bih by one or other approved methods of family planning. - demographers are of the view that the demographic goal of NRR=1 can be achieved only if the CPR exceeds 60%. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:493 <\\p>", 'role': 'assistant'}]