Heroin's Primary Effects: Addiction and Withdrawal

Steps:

• Heroin, an opioid, binds to brain receptors causing euphoria and rapid addiction through tolerance and dependence.
• It depresses the central nervous system, inducing drowsiness and reduced alertness, not delaying sleep onset.
• Long-term use leads to physical dependence with severe withdrawal symptoms like nausea, pain, and anxiety upon cessation.
• Evaluate choices by matching facts: addiction (true), delays sleep alertness (false), severe withdrawal (true).

Why C is correct:

• Heroin is a Schedule I controlled substance under U.S. law, defined by high abuse potential, no medical use, and severe physiological withdrawal effects confirming addiction and withdrawal accuracy.

Why the others are wrong:

• A incorrectly marks "delays sleep alertness" as true and withdrawal as false.
• B incorrectly marks addiction as false.
• D incorrectly marks all statements as false.

Final answer: C