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: Unknown
[{'content': 'All of the following are Non-parametric test, except: \nSelect and explain. \nA. Chi square test, B. Z test, C. Wilcoxon Rank sum test, D. Kruskal-Wallis ‘H’ test', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]