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
Non parametric test used to compare the medians of two independent samples 
Select and explain. 
A. t-test, B. Chi square test, C. Mann Whitney U test, D. Z test
C: Mann Whitney U test
Answer: C: Mann Whitney U test 
Explanation: None