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': "All are non - parametric tests, except \nSelect and explain. \nA. Chi - square test, B. Kruskal - wallis 'H' test, C. Z - test, D. Sign test", 'role': 'user'}, {'content': 'Answer: C \nExplanation: Parametric tests\nNon parametric tests\n\n\n\n\nQuantitative\nPaired student t - test\nUnpaired\xa0student t - test\nANOVA F - test\nZ - test\n\n\n\n\nQualitative\nSign test\nChisquare test\nWilcoxan tests', 'role': 'assistant'}]