This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Non communicable diseases, Subject name: Social & Preventive Medicine
Growth rate is calculated by ? 
Select and explain. 
A. Crude bih rate\/Crude death rate, B. Net reproduction - Crude death rate, C. Total feility rate - Crude death rate, D. Crude bih rate - Crude death rate
D: Crude bih rate - Crude death rate
Answer: D: Crude bih rate - Crude death rate 
Explanation: park's textbook of preventive and social medicine 23rd edition. *when crude death rate is subtracted from crude bih rate the net residual is the current annual growth rate.