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
Birth rate is - 
Select and explain. 
A. Live birth/1000 mid yr. population, B. Birth/1000 mid yr population, C. Live birth/10000 mid yr. population, D. Live birth/10,000 population of reproductive age group (15-45)
A: Live birth/1000 mid yr. population
Answer: A: Live birth/1000 mid yr. population 
Explanation: Fertility 

By fertility is meant the actual bearing of children.
A woman's reproductive period is roughly from 15 to 45 years - a period of 30 years.
Measurement of fertility are :-


Birth rate   
General fertility rate (GFR) 
General marital fertility rate (GMFR) 
Age specific fertility rate (ASFR)    
Age specific marital fertility rate (ASMFR) 
Total fertility rate (TFR)    
Total marital fertility rate (TMFR)
Gross reproduction rate (GRR)
Net reproduction rate (NRR)
Child woman ratio
Pregnancy rate
Abortion rate
Abortion ratio
Marriage rate

Birth rate

Birth rate defined as "the number of live birth per 1000 estimated mid yr. populations in a give yr."

Birth rate = Number of live birth during the year / Estimated mid year population x 1000