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
When we try to find out significance of difference in height of children between 2 classes in a school, which test is used? 
Select and explain. 
A. Unpaired test, B. ANOVA, C. Chisquare, D. Coefficient of variance
A: Unpaired test
Answer: A: Unpaired test 
Explanation: None