Give the source of caffeine.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding Caffeine**: Caffeine is a natural stimulant that affects the central nervous system, making a person feel more alert and awake.

2. **Identifying Sources of Caffeine**:
- **Tea Leaves**: One of the primary sources of caffeine is the leaves of the tea plant, scientifically known as *Camellia sinensis*. This plant is used to produce various types of tea, which contain caffeine.
- **Coffee Beans**: Another significant source of caffeine is the seeds of the coffee plant, specifically *Coffea arabica*. Coffee is one of the most popular beverages worldwide, known for its caffeine content.
- **Cocoa Beans**: Caffeine can also be found in the seeds of the cocoa plant, which is scientifically named *Theobroma cacao*. Cocoa is used to make chocolate and other products, contributing to caffeine intake.
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