This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory system, Subject name: Physiology
Hyperventilation in high altitude is due to 
Select and explain. 
A. Respiratory alkalosis, B. Respiratory acidosis, C. Hypercapnea, D. Decreased concentration of bicarbonate
A: Respiratory alkalosis
Answer: A: Respiratory alkalosis 
Explanation: Hyperventilation in high altitude is due to respiratory alkalosis Ref: guyton and hall textbook of medical physiology 12 edition page number:375,376,377