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
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: NRR of one is equivalent to attaining approximately the two child norm.
If NRR is <1 the reproductive performance of population is said to below replacement level.
NRR will be one when at least 60% of eligible couple are effectively practicising family planning.