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
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. 
Select and explain. 
A. A, B. B, C. C, D. D
A: A
Answer: A: A 
Explanation: 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.