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': 'Most significant indicator of fertility is - \nSelect and explain. \nA. Net reproductive rate, B. Family size, C. Gross reproduction rate, D. General fertility rate', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Net reproduction rate \n\nNet reproductive rate is defined as\n\n"The no. of daughters a new born girl will bear during her lifetime assuming fixed age specific fertility and mortality rates"\n\nIt is the only fertility related statistics which also takes mortality rates into consideration.\nNRR of one is equivalent to attaining approximately the two child norms.\nGoal of NRR=1 can be achieved only if at least 60%* of the eligible couples are effectively practicing family planning.\n\n\nGross reproduction rate (GRR): \n\nAverage number of girls that would be born to a married woman if she experiences the current fertility pattern throughout her reproductive span (15-44 or 49 year) assuming no mortality.', 'role': 'assistant'}]