AIIMS 2018 Zoology Hallucinogens MCQ Question

LSD (lysergic acid diethylamide) is classified as a hallucinogen, primarily affecting serotonin receptors in the brain, which leads to altered perceptions and sensory experiences. In contrast, morphine is an opioid that acts as a central nervous system (CNS) depressant, primarily binding to μ-opioid receptors to relieve pain, while cocaine is a stimulant that increases dopamine levels by inhibiting its reuptake, leading to heightened alertness and euphoria. Nicotine, although primarily a stimulant that affects acetylcholine receptors, does not produce hallucinogenic effects like LSD. Thus, option A is the only correct choice regarding hallucinogenic properties.