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
In defining "Effective literacy rate", the denominator is 
Select and explain. 
A. Total literate population, B. Population aged 7 yrs and above in a given year, C. Total mid-year population, D. Number of literate persons aged 7yrs and above
B: Population aged 7 yrs and above in a given year
Answer: B: Population aged 7 yrs and above in a given year 
Explanation: Effective literacy rate = Number of literate persons aged 7 and above* 100 / Population aged 7 and above in a given year.Ref:- Park. 23rd ed. Page no 486