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: Pharmacology
[{'content': 'Drug of choice for Mountain sickness: \nSelect and explain. \nA. Cinnarizine, B. Acetazolamide, C. Furosemide, D. Beta Histidine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Acetazolamide is a carbonic anhydrase inhibitor used in mountain sickness to reduce intracranial tension.', 'role': 'assistant'}]