A is a false treatment, such as a pill, "drug," or other substance, without any significant chemical properties or active ingredient.

placebo

Explanation:

A placebo can be defined as a fake treatment that is capable of producing a real response in the patients. In the placebo treatment the patient is cared and given the identical treatment as that of real treatment but the pill, drug, injection, or liquid given in this condition consists of inactive substances that do not exert any effect over the body. The patient thinks that it is a real kind of treatment. This is used for the purpose of research to know whether this condition affects the health in a positive sense for disease and ill patients.