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Pope Leo III crowned Charlemagne the first Holy Roman Emperor for
Inert Substance
A material or substance that does not undergo chemical change within a specified context, often used as a control in experiments.
Placebo
A substance with no therapeutic effect, often used in clinical trials as a control to test the effectiveness of drugs.
Placebo Injection
A treatment using a substance that has no therapeutic effect, used as a control in testing new drugs.
Control Group
In experimental research, a group of subjects that does not receive the treatment or intervention being studied and is used as a benchmark to measure the effects of the treatment.
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