This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Surgery
[{'content': 'Condition which does not cause metabolic acidosis? \nSelect and explain. \nA. Renal failure, B. Ureterosigmoidostomy, C. Pancreatic or biliary fistula, D. Pyloric stenosis', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Pyloric stenosis", 'role': 'assistant'}]