Which one of the following is a hallucinogenic drug?

LSD is a psychedelic drug causing optical and auditory hallucination and induces behavioural abnormalities. Opium and morphine are opiate narcotics and acts as depressants and analgesic. Caffeine is a stimulant. Related Theory Drug addiction can be due to - Stress, Curiosity, Peer pressure, To overcome frustrations and depressions, etc.