C <-- Alcohol
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The classification of substances can vary based on their effects on the central nervous system. Let's delve into the complexities of this classification.
a. Heroin: Heroin is an opioid drug derived from morphine, and it acts as a depressant on the central nervous system.
b. Concerta: Concerta is a stimulant medication commonly used to treat attention deficit hyperactivity disorder (ADHD). It works by increasing certain neurotransmitters' activity in the brain, so it is not classified as a depressant.
c. Alcohol: Alcohol is indeed classified as a depressant. It slows down brain function and affects neurotransmitter activity, leading to decreased activity in the central nervous system.
d. Marijuana: Marijuana, or cannabis, contains cannabinoids that can have varied effects, including depressant, stimulant, or hallucinogenic properties depending on the specific compounds and individual reactions. However, it's often classified as a depressant due to its overall sedative effects.
So, among the options provided, the substance classified as a depressant is: c. Alcohol.
