The Anti-Acne Medication Retin-A,also Used for Reduction of Wrinkles,has the Active

Multiple Choice

The anti-acne medication Retin-A,also used for reduction of wrinkles,has the active ingredient all-trans retinoic acid.It can be toxic if ingested,but surprisingly it is chemically related to other forms of vitamin A you get in your diet from

A) fruits.
B) vegetables.
C) liver.
D) dairy products.
E) All of the above