What are the dried leaves of the coca plant known for?

The dried leaves of the coca plant are primarily known for containing cocaine, a powerful stimulant that affects the central nervous system. When the leaves are processed, they can be extracted to isolate cocaine for medicinal and recreational use. Historically, indigenous cultures in South America have chewed coca leaves for their stimulating effects, which can help reduce fatigue and enhance physical performance.

While other options mention substances that come from different plants or processes—such as chocolate and vanilla flavoring—they are not related to the coca plant. The mention of antioxidants is also irrelevant in this context since the primary characteristic and significance of coca leaves lie in their psychoactive properties, specifically the presence of cocaine. Therefore, the correct choice highlights the key aspect of coca leaves' composition and their impact on human health and behavior, distinguishing it from other plant-based products that serve entirely different purposes.