This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Preoperative assessment and monitoring in anaesthesia, Subject name: Anaesthesia
[{'content': '0.9% sodium chloride contains ----- mmol/L of sodium \nSelect and explain. \nA. 154, B. 145, C. 131, D. 130', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 0.9% Sodium Chloride Injection, USP contains 9 g/L Sodium Chloride (sodium chloride (sodium chloride injection), USP (NaCl) with an osmolarity of 308 mOsmol/L. It contains 154 mEq/L sodium and 154 mEq/L chloride.', 'role': 'assistant'}]