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': 'Chi-square test is used for \nSelect and explain. \nA. Comparing percentage, propoions & fractions in paired data, B. Comparing percentage, propoions & fractions in two or more different group of individuals, C. Comparing percentage, propoions & fractions in matched paired data, D. Comparing percentage, propoions & fractions in two unpaired samples', 'role': 'user'}, {'content': 'Answer: B \nExplanation: - Chi-square test is used for comparing percentage, propoions & fractions in two or more different group of individuals. - Degree of freedom = - more accurate', 'role': 'assistant'}]