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
Bih rate is 
Select and explain. 
A. Live bih X 1000\/ mid yr. Population, B. Bih X 1000\/ mid yr population, C. Live bih X 10000\/ mid yr. Population, D. Live bih X 10000\/Population of reproductive age group (15-45)
A: Live bih X 1000\/ mid yr. Population
Answer: A: Live bih X 1000\/ mid yr. Population 
Explanation: Bih rate = number of live bihs during the year X 1000/ estimated mid year population. Unsatisfactory measure of feility because the total population is not exposed to child bearing. Reference : Park&;s textbook of preventive and social medicine, 23rd edition, pg no: 488