Which of the following statements about psychoactive drugs is correct?

• A. They are always safe and non-addictive
• B. They affect brain function and mental states
• C. They are only found in natural sources
• D. They can never be prescribed for therapeutic purposes

Answer: (B)

The statement that psychoactive drugs affect brain function and mental states is correct. Psychoactive drugs are substances that, when consumed, can alter perceptions, mood, consciousness, and behavior by interacting with the brain's neurotransmitter systems. This can result in a wide range of effects, from relaxation and euphoria to anxiety and hallucinations, depending on the substance and its dosage. Recognizing this aspect is crucial for understanding both the potential therapeutic benefits and risks associated with these substances.

The other statements are inaccurate. Psychoactive drugs are not always safe and can be addictive, which is why they must be used with caution, especially in therapeutic settings. Additionally, these drugs can be both natural (like certain plants) and synthetic (like many pharmaceuticals), meaning they are not exclusively found in natural sources. Lastly, many psychoactive drugs are prescribed for therapeutic purposes, such as antidepressants for depression or anxiolytics for anxiety, demonstrating their potential benefits when used under medical supervision.