Which of the following is an example of a Central Nervous System Depressant?

Answer: B — Alcohol

Alcohol is a Central Nervous System Depressant because it slows down the activity of the central nervous system resulting in a decrease in motor coordination, reaction time, and intellectual function. In contrast, cocaine (A) and nicotine (C) are both stimulants, meaning they speed up activity in the central nervous system. Mescaline (D) is a hallucinogen and affects perception and mood rather than directly impacting the central nervous system. Therefore, alcohol is the only correct answer as an example of a Central Nervous System Depressant.