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: Dental
[{'content': 'Statistical test used to relate two group values/ differences? \nSelect and explain. \nA. Kruskal Wallis, B. Spearman correlation, C. Kendall tau, D. Chi square', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]