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
In a clinical trial, blood pressure was measured between in a group of patients before and after treatment, which of the following test will be suitable as at test of significance? 
Select and explain. 
A. Paired t-test, B. Mann Whitney U test, C. Student test, D. ANOVA
A: Paired t-test
Answer: A: Paired t-test 
Explanation: Ans. A. Paired t-test