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': 'Aerial blood 02 in ml of 02 per dL: \nSelect and explain. \nA. 12.1, B. 19.8, C. 15.6, D. 27.8', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. 19.8', 'role': 'assistant'}]