All of the following drugs are classified as sedatives EXCEPT:

A) barbiturates.
B) alcohol.
C) opiates.
D) LSD.

Sedatives

Drugs that induce relaxation and sometimes intoxication by lowering the activity of the brain, the neurons, the muscles, the heart, and even by slowing the metabolic rate.

Barbiturates

Sedative and hypnotic drugs derived from barbituric acid that are used to treat anxiety, insomnia, and seizure disorders, but are associated with high risk of dependence.

Opiates

A class of drugs derived from opium that are used for pain relief, but can also be addictive.