This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Endocrinology, Subject name: Pharmacology
[{'content': 'Acetazolamide is \nSelect and explain. \nA. Competitive and reversible carbonic anhydrase inhibitor, B. Non-competitive and reversible carbonic anhydrase inhibitor, C. Competitive and irreversible carbonic anhydrase inhibitor, D. Non-competitive and irreversible carbonic anhydrase inhibitor', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Carbonic anhydrase inhibitor act by non-competitive but reversible inhibition of the enzyme. Examples include acetazolamide,dorazolamide and brinzolamide.', 'role': 'assistant'}]