Which of the following substances is included in cannabinoids/cannabinols?

The correct answer is THC, as it is one of the primary active components found in cannabis and falls into the category of cannabinoids. Cannabinoids are compounds that interact with cannabinoid receptors in the body, which are part of the endocannabinoid system. THC (tetrahydrocannabinol) is known for its psychoactive effects, providing the "high" associated with cannabis use.

In contrast, the other substances listed do not belong to the cannabinoid category. Heroin, cocaine, and LSD are entirely different classes of drugs, each with unique chemical structures, effects, and mechanisms of action. Heroin is an opioid, cocaine is a stimulant, and LSD is a hallucinogen, none of which interact with cannabinoid receptors. Therefore, THC is the only correct answer as it specifically represents a cannabinoid.