Which of the following is a source of carbohydrates?

Grains are a primary source of carbohydrates, providing essential energy for the body. Carbohydrates found in grains include starches, fiber, and sugars, which break down into glucose, the body's main energy source. Common examples of grains include wheat, rice, oats, and corn. These foods are fundamental in various diets worldwide, especially in forms like bread, pasta, and cereals, helping to fuel daily activities and maintain overall health.

While other options contain carbohydrates, grains are more specifically recognized for their high carbohydrate content. Meats and fats primarily consist of protein and lipids, respectively, with minimal to no carbohydrate content. Dairy products do contain some carbohydrates, primarily lactose, but their carbohydrate contribution is significantly less than that of grains in a typical serving.