This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Enzymes, Subject name: Biochemistry
[{'content': "A patient who wanted to go skiing in the Rockies took a medication to combat altitude sickness. A graph of this medication's mechanism of inhibition is shown. What type of inhibitor is this medication? \nSelect and explain. \nA. Competitive, B. Non-competitive, C. Irreversible, D. Allosteric", 'role': 'user'}, {'content': 'Answer: B \nExplanation: In noncompetitive inhibition, the Km is not altered, whereas the Vmax is decreased. The drug used to treat altitude sickness is acetazolamide, which is a noncompetitive inhibitor of carbonic anhydrase. The graph is one of a pure noncompetitive inhibitor.', 'role': 'assistant'}]