THC is primarily associated with which plant?

THC, or tetrahydrocannabinol, is the primary psychoactive compound found in the cannabis plant. It is responsible for the intoxicating effects commonly associated with marijuana use, influencing mood, perception, and overall cognitive function. The cannabis plant is distinct in its production of cannabinoids, including THC and CBD (cannabidiol).

In contrast, the other plants listed do not produce THC. Coca is known for its alkaloids, notably cocaine, while psyllium is derived from Plantago species and is primarily used for its fiber content. Opium comes from the poppy plant and contains opioids, such as morphine and codeine, and is unrelated to the cannabinoids produced by cannabis. Therefore, the correct association of THC directly links it to cannabis, illustrating its significance in the context of this multiple-choice question.