Question

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caffeine is a
and a natural component of the plants that are sources of coffee, tea, and cola drinks.
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Explanation:

Caffeine is a stimulant (it can also be described as an alkaloid, but "stimulant" is a common and accurate term here as it stimulates the central nervous system and is a natural component of coffee, tea, and cola - producing plants).

Answer:

stimulant (or alkaloid, but stimulant is more context - appropriate for the effect - related description here)