This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Biostatistics, Subject name: Social & Preventive Medicine
[{'content': "Appropriate statistical test to compare two propoions \nSelect and explain. \nA. Chi-square test, B. Student's t-test, C. Odds ratio, D. Correlation coefficient", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ref:Parks 23rd edition pg 852 Here, propoion is a Qualitative measure, so we use Chi-square. Tests of significance: Qualitative: Chi- square : 2 or more than 2 groups Mc Nemar test : 1 group. ( before and after intervention) Quantitative: Paired T test: 1 group Student T test/ unpaired T test: 2 groups Anova: more than 2 groups.', 'role': 'assistant'}]