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': 'A 70-year-old woman has a small-bowel fistula with output of 1.5 L/d. Replacement of daily losses should be handled using the fluid solution that has the following composition in mEq/L. \nSelect and explain. \nA. A, B. B, C. C, D. D', 'role': 'user'}, {'content': "Answer: A \nExplanation: The composition of small intestinal fluid issodium, 140 mEq/L; potassium, 5 mEq/L; chlo-ride, 104 mEq/L; and bicarbonate, 30 mEq/L. Daily losses are best replaced by administra-tion of balanced salt solution (Ringer's lactate) whose composition is depicted in A. Brepre-sents normal saline (0.9%), C is half normal saline (0.45%), D is M/6 sodium lactate, and E is 3% sodium chloride.", 'role': 'assistant'}]