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
[{'content': 'One molecule of B-Carotene gives rise to \nSelect and explain. \nA. 1 unit of Vitamin A, B. 2 units of Vitamin A, C. 3 units of Vitamin A, D. 4 units of Vitamin A', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]