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': 'Chi-square test tests: \nSelect and explain. \nA. Standard error of Mean, B. Standard error of Propoion, C. Standard error of difference between 2 Means, D. Standard error of difference between Propoions', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Standard error of difference between Propoions', 'role': 'assistant'}]