Final answer:
Among the given options, egg yolk and fortified milk are the best sources of preformed Vitamin A (3). Preformed Vitamin A is most abundant in animal-based foods like liver, fish, and eggs, and fortified dairy products. Excessive intake can lead to hypervitaminosis.
Step-by-step explanation:
The best source of preformed Vitamin A are animal-based foods and fortified products. Among the options provided, egg yolk and fortified milk are particularly rich in preformed Vitamin A.
Preformed Vitamin A, also known as retinol, is found in the highest quantities in meat, especially liver, as well as in fish and eggs. Fortified milk is another excellent source, as Vitamin A is often added to it to improve its nutritional content. While the body can convert beta-carotene from plant sources like carrots and sweet potatoes into Vitamin A, the preformed version from animal sources is more readily used by the body.
It is essential to include a variety of Vitamin A sources in your diet, but it is also important to note that excessive intake of fat-soluble vitamins can lead to hypervitaminosis, which is an excessive storage of vitamins in the body's lipid stores.