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
A normal-anion-gap metabolic acidosis occurs in patients with : 
Select and explain. 
A. Diarrhoea, B. Diabetic ketoacidosis, C. Methyl alcohol poisoning, D. Acute renal failure
A: Diarrhoea
Answer: A: Diarrhoea 
Explanation: Answer is A (Diarrhea): The differential diagnosis of normal anion gap acidosis : Hyperalimentation Acetazolamide and other carbonic anhydrase inhibitors Renal tubular acidosis Diarrhea: due to a loss of bicarbonate. Ureteroenteric fistula Pancreaticoduodenal fistula Spironolactone