This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Demography and family planning, Subject name: Social & Preventive Medicine
[{'content': 'Most significant indicator of feility is \nSelect and explain. \nA. Net reproductive rate, B. Family size, C. Gross reproductive rate, D. General feility rate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Net reproductive rate is defined as the number of daughters a newborn girl will bear during her life time assuming fixed age specific feility and moality rates It is a demographic indicator NRR of 1 is equivalent to attaining approximately the 2 child norm If NRR < 1, then the reproductive performance of the population is said to below replacement level Reference : Park&;s textbook of preventive and social medicine, 23rd edition, Page no: 489', 'role': 'assistant'}]