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': 'Carbonic anhydrase is an example of: \nSelect and explain. \nA. Lipoprotein, B. Phosphoprotein, C. Metalloprotein, D. Chromoprotein', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Metalloenzymes:\xa0\n\nThese enzymes hold the metals rather tightly which are not readily exchanged. e.g.,\xa0alcohol dehydrogenase, carbonic anhydrase, alkaline phosphatase, carboxypeptidase and aldolase contain zinc.\nPhenol oxidase (copper)\nPyruvate oxidase (manganese)\nXanthine oxidase (molybdenum)\nCytochrome oxidase (iron and copper)\n\nKey Concept:\nMetalloproteins: They contain metal ions. Examples are Hemoglobin (Iron), Cytochrome (Iron),\xa0Tyrosinase (Copper) and Carbonic anhydrase (Zinc).\nRef : Textbook of Biochemistry, Satyanarayana', 'role': 'assistant'}]