Brian ingested a drug at a party. He isn’t sure what he took, but he decides to go see his doctor just to be safe. When the doctor asks Brian to describe what he is feeling, Brian says that this is the most "spiritual" that he has ever felt and that he is "totally in touch with his feelings and the world around him." What class of drug did Brian most likely ingest?
a. depressant.
b. stimulant.
c. hallucinogen.
d. none of these.