Question: which one of the following is a hallucinogenic drug?
Answer: The most important of these are (1) d-lysergic acid diethylamide, commonly known as LSD-25, which originally was derived from ergot (Claviceps purpurea), a fungus on rye and wheat, (2) mescaline, the active principle of the peyote cactus (Lophophora williamsii), which grows in the southwestern United States and Mexico, ...