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
Crude bih rate denominator is - 
Select and explain. 
A. Total no of live bihs in that year, B. 1000 live bihs, C. Total number of bihs, D. Mid year population
D: Mid year population
Answer: D: Mid year population 
Explanation: <p> Crude bih rate= Number of live bihs in a year per 1000 mid-year population. Reference:Park&;s textbook of preventive and social medicine,K.Park,23rd edition,page no:488. <\p>