This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System Pa 3, Subject name: Physiology
[{'content': 'True about ascent to high altitude: \nSelect and explain. \nA. Respiratory acidosis, B. Polycythemia due to dehydration, C. Acute mountain sickness stas to develop on 7th day of ascent, D. Acetazolamide may be given prophylactically', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Respiratory alkalosis occurs Polycythemia is due to increased erythropoietin Acute mountain sickness develops 8-24 hr after arrival at altitude and lasts 4-8 days. Acute altitude illness: 3 forms Acute mountain sickness (AMS) The pathophysiology of AMS is not well understood. The essential factor responsible for this condition is hypoxemia High altitude cerebral edema (HACE) High altitude pulmonary edema (HAPE)', 'role': 'assistant'}]