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: Medicine
[{'content': 'Anion gap is increased in all except: September 2009 \nSelect and explain. \nA. Ureterostomy, B. Ethylene glycol, C. Methylene glycol, D. Diabetic ketoacidosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A: Ureterostomy', 'role': 'assistant'}]