The correct answer is Vitamin D.
Vitamin D is a fat-soluble vitamin that the body needs for many important functions, including bone growth and development, muscle function, and immune system health. The body can make vitamin D when exposed to sunlight, but it can also be found in some foods, such as fatty fish, eggs, and cheese.
Vitamin A is a fat-soluble vitamin that is essential for vision, skin health, and immune function. It is found in animal products, such as liver, eggs, and dairy products, as well as in some plant-based foods, such as carrots, sweet potatoes, and dark leafy greens.
Vitamin C is a water-soluble vitamin that is essential for the growth and repair of tissues, the production of collagen, and the absorption of iron. It is found in citrus fruits, berries, tomatoes, and broccoli.
Vitamin K is a fat-soluble vitamin that is essential for blood clotting, bone health, and wound healing. It is found in green leafy vegetables, broccoli, Brussels sprouts, and liver.