Which of the following is not a plant product?

Camphor is a product obtained from the wood of the camphor tree, especially Cinnamomum camphora.

Aloe vera is a well-known succulent plant species used for its medicinal and cosmetic properties.

Vanilla is derived from the seed pods of the orchid plant Vanilla planifolia.

All of these — camphor, aloe vera, and vanilla — are obtained from plants.

Therefore, the correct answer is Option D: All are plant products.