Which of the following is NOT a stimulant?

A) amphetamines
B) caffeine
C) nicotine
D) alcohol

Tolerance

The capacity to endure continued subjection to something, such as a drug or environmental conditions, without adverse reaction.

Drug

A substance which has a physiological effect when ingested or otherwise introduced into the body, often used for medicinal, recreational, or performance-enhancing purposes.

Effect

The change that is a result or consequence of an action or condition, often used in the context of examining causes and their impacts.