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
[{'content': 'Hypoxemia independent of \nSelect and explain. \nA. FiO2, B. Altitude, C. Hb, D. PaCO2', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Hypoxemia is a condition of decreased aerial po2.Ref: Ganong review of medical physiology 24th edition Page no: 649', 'role': 'assistant'}]