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: Social & Preventive Medicine
About chi-square test, true is 
Select and explain. 
A. Less no. of samples are associated with less error, B. <0.001 is statistically significant, C. Categories of data used in test need not be mutually exclusive and discrete, D. Tests correlation and regression
B: <0.001 is statistically significant
Answer: B: <0.001 is statistically significant 
Explanation: None