This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Pharmacology), Subject name: Pharmacology
Which of the following drug is used to prevent acute mountain sickness? 
Select and explain. 
A. Acetazolamide, B. Dexamethasone, C. Diltiazem, D. Digoxin
A: Acetazolamide
Answer: A: Acetazolamide 
Explanation: Ans. A. AcetazolamideAcetazolamide is effective in preventing acute mountain sickness (AMS), high altitude pulmonary edema (HAPE), and high altitude cerebral edema (HACE).Mechanism in above pathology:* Counteracts the respiratory alkalosis which occurs during ascent to altitude* Facilitates the excretion of bicarbonate in the urine* Decreases pH of CSF* Decreases CSF formation