This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General surgery, Subject name: Surgery
[{'content': 'Concentration of Na (meq/I) in normal saline is ? \nSelect and explain. \nA. 77, B. 109, C. 130, D. 154', 'role': 'user'}, {'content': 'Answer: D \nExplanation: sodium in various fluids normal saline - 154mmol/l ECF - 142mmol/l lactated ringer - 130mmol/l', 'role': 'assistant'}]