【单选题】根据内容回答题. Clinical Trials 1 Many clinical trials are done to see if a new drug or device is safe and effective for people to use. Sometimes clinical trials are used to study different ways to use the s...
A.
Are clinical trials safe?
B.
What are clinical trials?
C.
What should people know before participating in a clinical trial?
D.
Who should consider clinical trials and why?
E.
Where are clinical trials conducted?
F.
Why are clinical trials done?