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
[{'content': 'About chi-square test, true is \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]