Barbiturates are synthetic drugs that​

A) ​are classified as steroids.
B) ​have little or no tolerance, dependence, or withdrawal properties.
C) ​are taken recreationally as "stay awake" pills.
D) ​produce both tolerance and dependence.

Barbiturates

A class of drugs that act as central nervous system depressants, used medically for sedation, anesthesia, or treatment of certain conditions.

Tolerance

The process by which the body becomes less responsive to a substance or a physiological stimulus after repeated exposure.

Dependence

A state in which there is a physical or psychological compulsion to take a substance or engage in an activity, often leading to addiction.