Which of the following vitamins are classified as fat-soluble?

Fat-soluble vitamins are those that can dissolve in fats and oils and are typically stored in the body's fatty tissues and liver. The vitamins that are classified as fat-soluble include vitamins A, D, E, and K.

Vitamin A is essential for vision, immune function, and skin health. Vitamin D is crucial for calcium absorption and bone health, and it also plays a role in immune function. Vitamin E acts as an antioxidant, protecting cells from damage, and is important for immune health. Vitamin K is essential for blood clotting and bone metabolism.

These vitamins require dietary fats for proper absorption in the digestive tract, which is a key characteristic that distinguishes them from water-soluble vitamins that do not have such storage capability in the body and need to be consumed more regularly. Thus, the combination of A, D, E, and K represents the complete group of fat-soluble vitamins.