This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: NEET 2018, Subject name: Biochemistry
[{'content': 'Most abundant form of pro-vitamin A is:- \nSelect and explain. \nA. Beta carotene, B. Alpha-carotene, C. Retinol, D. Retinaldehyde', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Carotenoids are provitamins of vitamin A which are present in plants. Most impoant carotenoid is beta carotene , which consists of two molecules of retinal joined end to end. ADDITIONAL READING ON VITAMIN A: There are three biologically active forms of Vitamin A: Retinol: necessary for reproductive system Retinal: involved in vision Retinoic acid: involved in growth and cellular differentiation Retinoids are all-natural/ synthetic compounds with Vitamin A like activity.', 'role': 'assistant'}]