Explanation:

- Option 2: Acorn

- This is the correct answer. The nut of an oak tree is called an acorn. Acorns are the seeds that grow on oak trees and can be found in a variety of sizes and colors.

- Option 1: Kola nut

- The kola nut comes from the kola tree, which is native to Africa. It is different from an acorn and is used traditionally in cultural practices and to flavor beverages.

- Option 3: Macadamia

- Macadamia nuts come from macadamia trees, primarily found in Australia and Hawaii. These nuts are known for their rich, buttery flavor.

- Option 4: Chestnut

- Chestnuts grow on chestnut trees. They are different from acorns and are often roasted and eaten during festive seasons.