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
Drug of choice for Mountain sickness: 
Select and explain. 
A. Cinnarizine, B. Acetazolamide, C. Furosemide, D. Beta Histidine
B: Acetazolamide
Answer: B: Acetazolamide 
Explanation: Acetazolamide is a carbonic anhydrase inhibitor used in mountain sickness to reduce intracranial tension.