Multiple choice Vitamin D is synthesised in skin by the action of sunlight upon which of the following? Cephano cholesterol 7-Dehydrocholesterol Cholesterol All of the above - Reveal answer Fill a bubble to check yourself B Correct answer Explanation 7-Dehydrocholesterol is a type of cholesterol that functions in the serum as a cholesterol precursor and is converted to vitamin D₃ in the skin.