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
While testing a hypolipidemic drug, serum lipid levels were tested both before and after its use. Which test is best suited for the statistical analysis of the result? 
Select and explain. 
A. Paired T test, B. Student's test, C. Chi square test, D. None of the above
A: Paired T test
Answer: A: Paired T test 
Explanation: Paired T-test: is applied to paired data when each individual gives a pair of observation, such as when observations are made both before and after the play of a factor, e.g. Pulse rate before and after administration of a drug. In the question above serum lipid levels were tested both before and after administering a hypolipidemic drug. A paired t-test therefore is most suitable in this case. Ref: Fundamentals of Bio statistics, 2nd Edition By Rastogi V. B, Page 280