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 to measure the degree of: 
Select and explain. 
A. Causal relationships between exposure and effect, B. Association between two variables, C. Correlation between two variables, D. Agreement between two observations
B: Association between two variables
Answer: B: Association between two variables 
Explanation: None