Answer:
Placebo effect
Explanation:
Placebo effect: In psychology, the term placebo effect is referred to as a phenomenon or concept whereby a few persons experience benefit or gain after the implementation of a particular inactive substance, thing, or a shams treatment.
Generally, the placebo is considered as a specific substance that possesses zero medical effects, for example, sugar capsules, sterile water, and saline solution.
In the question above, the given statement represents the placebo effect.