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
ANOVA is used: 
Select and explain. 
A. To compare means in 2 groups, B. To compare means in 3 or more groups, C. To compare means in 1 group before and after intervention, D. To find correlation
B: To compare means in 3 or more groups
Answer: B: To compare means in 3 or more groups 
Explanation: None