This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Statistical Tests, Subject name: Social & Preventive Medicine
[{'content': "The appropriate statistical test to find out obesity as a significant risk factor for breast cancer is: \nSelect and explain. \nA. Student's paired 't' test, B. Student's unpaired 't' test, C. Chi-square test, D. Wilcoxon's signed rank test", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Obesity is qualitative variable ; breast cancer also qualitative. So, appropriate statistical test to find out obesity as a significant risk factor for breast cancer is Chi-square test.', 'role': 'assistant'}]