Which of the following is an example of a plant alkaloid?

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Caffeine is an example of a plant alkaloid, which is a large and diverse group of compounds that are produced by plants and often have pharmacological effects on animals. Tannin (A) and lignin (B) are not alkaloids but rather types of plant polyphenols and structural components, respectively. Latex (D) is a milky sap that contains a variety of organic compounds, including alkaloids, but it is not itself an alkaloid.

Which of the Following Is an Example of a Plant