Final answer:
Hallucinogens are a class of drugs that cause profound alterations in sensory and perceptual experiences.
Step-by-step explanation:
Your answer is b. hallucinogen. Hallucinogens are a class of drugs that cause profound alterations in sensory and perceptual experiences. They can cause hallucinations, distorted perception of time, and vivid visual experiences. Examples of hallucinogens include LSD, mescaline, nitrous oxide, and psilocybin.