The richest source of vitamin A are palm oil and carrot. Vitamin A is a fat-soluble vitamin that is important for vision, immune function, and skin health. Palm oil is a rich source of beta-carotene, which is converted to vitamin A in the body. Carrots are also rich in beta-carotene, which makes them an excellent source of vitamin A. Rice and oranges are not particularly high in vitamin A, and while groundnut oil contains some vitamin A, it is not as rich a source as palm oil or carrot.