Which of the following substances is classified as a depressant?

Alcohol is classified as a depressant because it acts primarily on the central nervous system to slow down brain activity. This can result in effects such as reduced anxiety, impaired motor coordination, and a general sense of relaxation. Depressants can affect neurotransmitters in the brain, leading to decreased arousal and sedation. In contrast, other substances listed do not fall under the depressant category; for example, Ritalin is a stimulant, Ketamine is considered a dissociative anesthetic with stimulant properties, and Psilocybin is a hallucinogen. Understanding these classifications is essential for recognizing how different substances can impact behavior and physiological functions in varying ways.