This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Definition & Concepts, Subject name: Social & Preventive Medicine
If TFR in a population is 4, then GRR would be (approx.) 
Select and explain. 
A. 2, B. 4, C. 8, D. 16
A: 2
Answer: A: 2 
Explanation: - GRR or NRR= 1/2 TFR (approx.) - In given question, TFR is 4; hence GRR is half of 4 = 2