One major grouping of hallucinogens typically allows the user to remain in some touch with the real world and to remember much of what he or she experienced. this group of drugs was referred to as

The correct answer is "Phantastica".

Explanation:

"Phantastica" is a term that was used to describe the effects that certain drugs have on the body, that seem to create a world of fantasy in people's mind. The word "Phantastica" honor the title of a book with the same name published by Louis Lewin that describes a series of psychoactive plants. Nowadays, "Phantastica" is the name of a major grouping of hallucinogens that create a world of fantasy while the user remain in some touch with the real world. This group include peyote, psilocybin and LSD drugs.

i think the answer is

mass

it would be c. xylem.