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
Crude birth rate is a simplest measure of fertility because it includes 
Select and explain. 
A. Mid year population, B. Total population, C. Live births only, D. Pre-term births
A: Mid year population
Answer: A: Mid year population 
Explanation: Crude birth rate : Number of live births in a year per 1000 mid-year population.
CBR is simplest indicator of fertility : Total mid-year population is not exposed to child bearing thus it doesnot give true idea of fertility of a population.