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': 'In oxyhemoglobin dissociation curve, the 95°/a\noxygen saturation corresponds __________ oxygen\ntension in arterial blood \nSelect and explain. \nA. 80 mm Hg, B. 90 mm Hg, C. 60 mm Hg, D. 70 mm Hg', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]