This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'Increased anion gap is seen in all except? \nSelect and explain. \nA. Fistula, B. Starvation, C. Ethylene glycol poisoning, D. Phenformin', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Fistula- normal anion gap is seen CAUSES OF NON ANION GAP METABOLIC ACIDOSIS(NAGMA)', 'role': 'assistant'}]