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
All are non-parametric tests except - 
Select and explain. 
A. Chi-square test, B. Sign test, C. Fisher exact test, D. Student t-test
D: Student t-test
Answer: D: Student t-test 
Explanation: Ans. is 'd' i.e., Student t-test