<prompt> Which of the following drug is used to prevent acute mountain sickness?AcetazolamideDexamethasoneDiltiazemDigoxin  <response>: 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 