Read Each Detail and Choose the Most Appropriate Topic

Read each detail and choose the most appropriate topic.
-What is the topic of the following details? When testing a new antidepressant drug, researchers choose volunteers who have no History of mental illness.Researchers track dosages of the drug and the side effects that arise.Patients being tested may not even be taking the actual drug; they may be taking aPlacebo (sugar pill) instead.Researchers do not know who is taking the drug and who is not until the study is over.

A) Antidepressants
B) Mental illness
C) Parameters of testing antidepressants
D) Side effects of antidepressants