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
Increased anion gap is seen in all except? 
Select and explain. 
A. Fistula, B. Starvation, C. Ethylene glycol poisoning, D. Phenformin
A: Fistula
Answer: A: Fistula 
Explanation: Fistula- normal anion gap is seen CAUSES OF NON ANION GAP METABOLIC ACIDOSIS(NAGMA)