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
[{'content': 'Which of the following is a cause of metabolic acidosis with normal anion gap? \nSelect and explain. \nA. Diabetic ketoacidosis, B. Aspirin poisoning, C. Lacts acidosis, D. Renal tuburlar acidosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Metabolic Acidosis Normal anion gap acidosis (low serum HCO3 but normal anion gap) is caused by excess bicarbonate loss from either the gut (diarrhea) or kidney (renal tubular acidosis). An elevated or so-called positive anion gap suggests the presence of another unmeasured anion Ref Davidson 23rd edition pg 364', 'role': 'assistant'}]