This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
[{'content': 'B-Carotene, precursor of vitamin A, is oxidatively cleaved by: \nSelect and explain. \nA. b-Carotene dioxygenase, B. Oxygenase, C. Hydroxylase, D. Transferase', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A. b-Carotene dioxygenaseCarotene is cleaved by b-carotene dioxygenase of intestinal cells to release 2 moles of retinal which is reduced to retinol.', 'role': 'assistant'}]