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
[{'content': 'Population growth is said to be less than adequate requirement when NRR is - \nSelect and explain. \nA. < 1, B. 1, C. > 1, D. 0', 'role': 'user'}, {'content': 'Answer: A \nExplanation: NRR of one is equivalent to attaining approximately the two child norm.\nIf NRR is <1 the reproductive performance of population is said to below replacement level.\nNRR will be one when at least 60% of eligible couple are effectively practicising family planning.', 'role': 'assistant'}]