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: Surgery
[{'content': 'Sodium content of one liter of isotonic saline is: \nSelect and explain. \nA. 130 mEq, B. 154 mEq, C. 40 mEq, D. 70 mEq', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]