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Clinical trials for drugs include
a. animal testing.
b. human testing only.
c. tests on cell cultures.
d. human testing and a comparison test with existing drugs. .

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TheDoctorDonna3
It could be C. or D. but I know that it isn't just human trails. I thought that there were also animal trails but I'm not sure.
It would be D. They need to have a control group that is taking the current recommended treatment to see if this new treatment is more effective than the standard treatment.

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