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: Physiology
[{'content': 'Compensating mechanisms involved at high altitude is \nSelect and explain. \nA. Hyperventilation, B. Hypoventilation, C. Respiratory depression, D. Respiratory acidosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: The most important compensatory mechanism that occurs at high altitude is hyperventilation. This may lead to respiratory alkalosis which is not a compensatory effect but may cause an opposing effect at the respiratory centre, to hypoxic stimulation.', 'role': 'assistant'}]