What substance is derived from the cannabis sativa plant and helps some people relax while elevating mood?

The correct answer, derived from the cannabis sativa plant, is marijuana. Marijuana contains cannabinoids, particularly tetrahydrocannabinol (THC), which interact with the body's endocannabinoid system. This interaction can lead to feelings of relaxation and an elevation in mood for some individuals. The psychoactive effects of THC contribute to its use for recreational and medicinal purposes, where people often seek relief from anxiety, stress, and pain.

In contrast, substances like cocaine are stimulants known for their effects on mood and energy levels but do not have the relaxing properties associated with marijuana. PCP and LSD are hallucinogens and have very different mechanisms of action and effects on the mind and body, which typically do not include the relaxing and mood-elevating properties attributed to marijuana. Thus, marijuana is distinctly recognized for its calming and euphoric effects on those who consume it.