What is a placebo and why is it used in some studies?

Basic Clinical Laboratory Techniques 6E
6th Edition
ISBN:9781133893943
Author:ESTRIDGE
Publisher:ESTRIDGE
Chapter1: The Clinical Laboratory
Section1.9: Quality Assessment
Problem 3RQ
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What is a placebo and why is it used in some studies?

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Placebos is a type of drug not but it is not exactly a drug, they look identical like a real drug which does not contain active chemical and harmless to human. Placebos drug can relieve some symptoms but it cannot treat a diseases.

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