Explanation:

Vitamin D is a fat-soluble vitamin that is naturally present in very few foods, added to others, and available as a dietary supplement. It is also produced endogenously when ultraviolet rays from sunlight strike the skin and trigger vitamin D synthesis. 

Some of its Sources are: Cod liver oil, Trout, Salmon, Mushrooms, Milk, Sardines, Soy, almond, and oat milks, Ready-to-eat cereal, Egg, Tuna fish