When researchers are planning medical research with experimental and placebo groups, it is true that
a. they can withhold treatment in a research project as long as they report it in their research report.
b. they are not allowed to put participants at risk by withholding treatment even if millions of people will later benefit from the research results.
c. they can withhold treatment from the placebo group only if the treatments being used have not been systematically tested before.
d. they can prescribe experimental treatments without patient knowledge only if there is a 95% chance or greater that the new treatment will work.
B
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