Question

in an experiment testing whether a new drug reduces headaches, what would the control group receive?
a different medication
a placebo (inactive substance)
a double dose of the drug
nothing at all

Explanation:

In a drug - testing experiment, the control group is used to compare the effects of the new drug. A placebo is given to the control group to account for the placebo effect, which is the psychological improvement in symptoms from believing one is receiving treatment. Giving a different medication, a double - dose of the drug, or nothing at all would not properly isolate the effect of the new drug.

Answer:

B. A placebo (inactive substance)