Which of the following is a source of vitamin A?

Liver is recognized as a rich source of vitamin A, particularly in its active form, retinol. The liver contains high concentrations of this essential nutrient because it plays a key role in storing and metabolizing vitamin A in the body. When consumed, the retinol from liver is readily absorbed and utilized, making it one of the most bioavailable sources of vitamin A.

In contrast, while rice, potatoes, and pasta are important components of many diets, they do not contain vitamin A in significant amounts. Instead, these foods are primarily sources of carbohydrates and provide various other nutrients, but not the specific vitamin A compounds that are crucial for functions such as vision, immune system performance, and skin health.