This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid, Electrolyte and Nutrition, Subject name: Surgery
[{'content': 'Sodium content of one liter of isotonic saline is:- \nSelect and explain. \nA. 140 mEq, B. 154 mEq, C. 40 mEq, D. 70 mEq', 'role': 'user'}, {'content': "Answer: B \nExplanation: Sodium content of one liter of isotonic saline is 154 mEq. Composition of crystalloid and colloid solutions (mM/L) Solution Na+ K+ Ca2+ Cl- Lactate Colloid Hamann's (RL) 130 4 < 2.7 109 28 Normal saline (0.9% NaCl) 154 154 Dextrose saline (4% dextrose in 0.18% saline) 30 30 Gelofusine 150 <1 150 Gelatin 4% Hemacel 145 5.1 < 6.26 145 Polygelin 75 g/L Hetastarch Hydroxyethyl starch 6% Lactated potassium saline injection (Darrow's solution) 121 35 103 53", 'role': 'assistant'}]