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
Increased "Anion gap' is a characteristic feature 
Select and explain. 
A. Hyperosmolar non-ketotic diabetic coma, B. Hypoglycaemic coma, C. Phenformin toxicity with coma, D. Renal tubulae acidosis
C: Phenformin toxicity with coma
Answer: C: Phenformin toxicity with coma 
Explanation: None