Which statement regarding psychoactive drugs is true?

• A. Psychoactive drugs can alter mood, perception, and behavior by affecting the central nervous system.
• B. Psychoactive drugs only produce effects when taken in large doses.
• C. Psychoactive drugs do not influence neurotransmitter activity in the brain.
• D. All psychoactive drugs are illegal and have no medical uses.

Answer: (A)

Verified step by step guidance

1. Understand the definition of psychoactive drugs: these are substances that affect the central nervous system and can alter mood, perception, and behavior.
2. Recognize that psychoactive drugs work by influencing neurotransmitter activity in the brain, either by mimicking, blocking, or altering the release and reuptake of neurotransmitters.
3. Evaluate the given statements by comparing them to the scientific understanding of psychoactive drugs: they do not require large doses to produce effects, as even small amounts can alter brain function.
4. Note that not all psychoactive drugs are illegal; many have legitimate medical uses, such as antidepressants, anxiolytics, and pain medications.
5. Conclude that the true statement is the one that correctly describes the effect of psychoactive drugs on mood, perception, and behavior through their action on the central nervous system.