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
0.9% sodium chloride contains ----- mmol/L of sodium 
Select and explain. 
A. 154, B. 145, C. 131, D. 130
A: 154
Answer: A: 154 
Explanation: 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.