Which of the following is NOT one of the five categories of controlled substances?

The correct answer is Alcohol because it is not classified as one of the five categories of controlled substances established under the Controlled Substances Act. The five categories typically include narcotics, hallucinogens, stimulants, depressants, and anabolic steroids.

Narcotics are substances that relieve pain and can induce sleep. Hallucinogens are drugs that alter perception, mood, and cognitive processes. Stimulants, on the other hand, increase alertness and energy by enhancing the activity of certain neurotransmitters in the brain. Alcohol, while regulated, does not fall under the same legal framework as these substances. Its regulation is generally handled through separate laws related to intoxication and the sale of beverages, rather than the controlled substances classification. This distinction sets it apart from the listed categories.