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': "Concentration of sodium in Ringer's lactate is: \nSelect and explain. \nA. 154 mEq/L, B. 120 mEq/L, C. 130 mEq/L, D. 144 mEq/L", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]