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': 'The oxidation of retinol produces:- \nSelect and explain. \nA. Retinine, B. Beta-carotene, C. Retinal, D. Retinoic acid', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Retinal (vitamin A aldehyde):\xa0\nThis is an aldehyde form obtained by the oxidation of retinol.\xa0\nRetinal and retinol are interconvertible.\nKey Concept:\nOxidation of retinol produces retinal\nOxidation of retinal produces retinoic acid.\nRef : Textbook of Biochemistry, Satyanarayana', 'role': 'assistant'}]