Final answer:
Marijuana is metabolized and excreted most slowly compared to alcohol, morphine, psilocybin, and LSD, due to THC being fat-soluble and lingering in the body's fat tissue for a significant period.
Step-by-step explanation:
The question is asking about the metabolism and excretion rates of various drugs. Among the options provided — alcohol, marijuana, morphine, psilocybin, and LSD — marijuana is the drug that is metabolized and excreted most slowly. The active compound in marijuana, THC, is fat-soluble and can remain in the body's fat tissue for a prolonged period, leading to detection in the body for weeks or even months after use. On the other hand, substances like alcohol and morphine are metabolized more quickly. Psilocybin is also relatively rapidly metabolized, and although LSD is potent at very low doses and can have long-lasting effects, it is also metabolized at a moderate rate.