This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Fluid and electrolytes, Subject name: Medicine
Increased "Anion gap' is a characteristic feature of- 
Select and explain. 
A. Hyperosmolar non-ketotic diabetic coma, B. Hypoglyoaemic coma, C. Phenformin toxicity with coma, D. Renal tubulae acidosis
A: Hyperosmolar non-ketotic diabetic coma
Answer: A: Hyperosmolar non-ketotic diabetic coma 
Explanation: Increased anion gap acidosis : Ketoacidosis Lactic acidosis Salicylate overdose Methanol Ref Davidson 23rd edition pg 346