Which of the following is NOT considered an animal byproduct?

The correct choice is cheese, as it is not classified as an animal byproduct. Cheese is a dairy product that is produced from milk, which can come from various animals, primarily cows, goats, and sheep. While milk itself is an animal-derived product, the process of making cheese involves the transformation of milk rather than the use of byproducts from the animal after it has been processed for other purposes.

In contrast, gelatin, leather, and bone meal are all derived from parts of animals that are processed after their primary use for food or other purposes. Gelatin is obtained from the collagen found in animal bones and skin, leather is made from animal hides, and bone meal is a product created from ground animal bones, often used as a fertilizer or animal feed. These products are classified as animal byproducts because they originate from parts of the animal that are utilized in various industries aside from the direct food supply.