Step 1: Understanding the sources of LSD.
Lysergic acid diethyl amide (LSD) is a powerful hallucinogenic drug derived from the ergot fungus, a parasitic fungus that grows on certain grains.
Step 2: Analyzing the options.
(A) inflorescence of Cannabis: Incorrect — Cannabis is the source of marijuana, not LSD.
(B) latex of poppy plant: Incorrect — The poppy plant produces opiates, not LSD.
(C) leaves of Datura plant: Incorrect — Datura contains tropane alkaloids but not LSD.
(D) ergot fungus: Correct — LSD is derived from ergot fungus, which grows on rye and other cereals.
Step 3: Conclusion.
The correct answer is (D) ergot fungus, as LSD is derived from the ergot fungus.