Which of the following combinations of biologically active molecules does vitamin A consist of?: (A) Retinol, retinal and retinoic acid, (B) Retinol, retinal and tetrahydrofolate, (C) Retinol, Iconjugase and retinoic acid, (D) PABA, retinal and retinaldehyde
Answer is A. The term retinoids is often used to include the natural and synthetic forms of vitamin A Retinol, retinal and retinoic acid are regarded as vitamers of vitamin A. beta-Carotene (provitamin A): This is found in plant foods ref Satyanarayana 4th ed page 119