Where can fructose be commonly found?

Fructose is a simple sugar that is most commonly found in fruits, which is why the correct answer is associated with this option. It is one of the main natural sugars present in many fruits, giving them their sweet taste. When fruits ripen, their fructose content generally increases, making them sweeter and more palatable.

Additionally, while small amounts of fructose can be found in other foods, such as certain vegetables, grains, and dairy products, the concentration is significantly higher in fruit. This is why fruits are often emphasized as a primary source of fructose in dietary recommendations. In contrast, dairy products primarily contain lactose, and grains tend to have mostly starches and other complex carbohydrates.