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
Chi square test is used for? 
Select and explain. 
A. Association between two variables, B. Correlation between two variables, C. Mean comparison of two group, D. S.D. of two variables
A: Association between two variables
Answer: A: Association between two variables 
Explanation: None