This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
Vitamin A is present in all of the following sources of diet, EXCEPT: 
Select and explain. 
A. Sunflower seeds, B. Egg, C. Milk, D. Tomato
A: Sunflower seeds
Answer: A: Sunflower seeds 
Explanation: Sunflower seeds are unusually rich in B complex vitamins. Sunflower seeds also contain a potent antioxidant team of selenium and vitamin E and are significantly deficient in vitamin A. There are two sources of dietary vitamin A. The first, or active form (retinol), is immediately available to the body and can be obtained from animal products such as milk, egg yolk, fish and liver. The second, or precursor form (beta-carotene), can be obtained from fruit and vegetables, and is conveed to the active form in the body.