This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: vitamins, Subject name: Biochemistry
Which of the following does not contain carotene? 
Select and explain. 
A. Potato, B. Tomato, C. Carrot, D. Spinach
A: Potato
Answer: A: Potato 
Explanation: Beta carotene is the pro-vitamin of vitamin A .It is present in plant tissues.It has two beta iodine rings connected by a pollyprenoid chain.One molecule of beta carotene can give rise to two molecules of vitamin A ;but it may produce only in biological systems. Vegetable sources contain the yellow pigment beta carotene.Carrot contains significant quantity of beta carotene.Papaya , mango, pumpkins gre.en leafy vegetables (spinach,amaranath) are other good sources of vitamin A . Reference:DM VASUDEVAN Textbook SEVENTH EDITION; PAGENO: 464, 469.