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
True about crude bih rate is all except 
Select and explain. 
A. Ratio, B. Feility indicator, C. Stillborn excluded, D. Not affected by age distribution of the population
A: Ratio
Answer: A: Ratio 
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 Bih rate is not a ratio. In ratio, the numerator is not a component of denominator Reference : Park&;s textbook of preventive and social medicine, 23rd edition, pg no: 55,488