This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Mechanisms of Enzyme Action, Subject name: Biochemistry
[{'content': 'Zinc is essential for - \nSelect and explain. \nA. Pyruvate lrinase, B. Cytochrome oxidase, C. Xanthine oxidase, D. Carbonic anhydrase', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Carbonic anhydrase", 'role': 'assistant'}]