Question

drag the missing word into place
in the study, one group was given headache medicine and the other was
given a
.
conclusion
method
placebo

Explanation:

In a medical or scientific study (especially a clinical trial), when testing a medicine, one group gets the actual medicine and the other group gets a "placebo" (a substance with no therapeutic effect, used as a control). "Conclusion" refers to the end result of a study, and "method" refers to the procedure, so neither fits here. The correct word is "placebo".

Answer:

placebo