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
Population growth is said to be less than adequate requirement when NRR is 
Select and explain. 
A. < 1, B. 1, C. > 1, D. 0
A: < 1
Answer: A: < 1 
Explanation: 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 is less than 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