Which of the following doesn't cause metabolic acidosis-: (A) Pyloric stenosis, (B) Renal failure, (C) Ureterosigmoidostomy, (D) Pancreatic Fistula
Answer is A. Uretrosigmoidostomy and pancreatic fistula causes non anion gap metabolic acidosis, whereas renal failure causes high anion gap acidosis. (Ref: Harrison's principles of internal medicine,19E pg 320)