Heroin's primary effects and misconceptions

Steps:

• Recall heroin as an opioid causing physical dependence, leading to withdrawal symptoms like nausea and pain when use stops.
• Note heroin's initial rush can mimic stimulation by releasing dopamine, though it overall depresses the central nervous system.
• Evaluate choices for accurate effects: withdrawal is universal, but stimulation is debated in initial phase.
• Eliminate options with incomplete or incorrect combinations, selecting the best match for core effects.

Why B is correct:

• Heroin induces dependence with severe withdrawal upon cessation and provides an initial euphoric "rush" that stimulates dopamine release in the brain's reward system.

Why the others are wrong:

• A includes injecting risks AIDS (true) but wrongly adds stimulation as a primary effect.
• C omits the stimulatory rush, covering only withdrawal.
• D lacks withdrawal symptoms, focusing on incomplete risks and false stimulation.

Final answer: B