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
In crude death rate the population is taken as on - 
Select and explain. 
A. 1st March, B. 1st July, C. 1st April, D. 15th August
B: 1st July
Answer: B: 1st July 
Explanation: A rate comprises the following elements →

i) Numerator
ii) Denominator
iii) Time specification       
iv) Multiplier
Numerator → Refers to the number of times an event (e.g. sickness, birth, death) has occurred in a population, during a specified time period. Numerator is a component of the denominator in calculating a rate, but not in a ratio.
Denominator → Denominator may be :-
i) Related to population
Mid year population → population estimated on first of July of an year
Population at risk
Person - time
Person distance
ii) Related to total events
 As in case fatality rate, denominator is total number of cases rather than total population.