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: Dental
The age of the child used in the determination of child mortality rate is: 
Select and explain. 
A. 0-5 years, B. 1-4 years, C. 5-8 years, D. 0-1 years
B: 1-4 years
Answer: B: 1-4 years 
Explanation: None