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
The denominator used for calculating literacy rate is 
Select and explain. 
A. Population above 7 years, B. Population above 14 years, C. Entire population, D. Per 1000 population
A: Population above 7 years
Answer: A: Population above 7 years 
Explanation: None