Which vitamin among the following is soluble in fat?

Vitamin A is classified as a fat-soluble vitamin, which means it dissolves in fats and oils rather than water. This characteristic allows it to be stored in the body's fatty tissues and the liver, providing a reservoir for the body to draw upon when needed. Fat-soluble vitamins, including Vitamin A, require dietary fats for proper absorption, and they play crucial roles in various bodily functions such as vision, immune function, and skin health.

In contrast, Vitamin C and the B vitamins, such as B12, are water-soluble. These vitamins need to be consumed more regularly, as they are not stored in significant amounts in the body and excess amounts are excreted in urine. Vitamin K, while also fat-soluble, is not the correct answer in this case since the question specifically identifies Vitamin A as the focus of the query.