Final answer:
The psychoactive drug found in the peyote cactus is mescaline. It is traditionally used by Native Americans in religious ceremonies.
Step-by-step explanation:
The correct answer is c) Mescaline.
Peyote cactus contains the psychoactive drug called mescaline. Mescaline is the main ingredient in the peyote cactus and is responsible for its hallucinogenic effects. It has been traditionally used by Native Americans in religious ceremonies for thousands of years.
Mescaline is a serotonin agonist, meaning it affects the serotonin neurotransmitter system in the brain. This is different from other psychoactive drugs like LSD and psilocybin, which also have hallucinogenic effects but work through different mechanisms.