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 IMR, age of infants is considered – 
Select and explain. 
A. Below 1 month, B. Below 1 year, C. Upto 1 year, D. 28 days
B: Below 1 year
Answer: B: Below 1 year 
Explanation: Infants are children less than 1 year of age.

Infant mortality rate
"The ratio of infant death in a year to the total number of live birth in that year. But it is usually expressed as a rate per 1000 live birth".