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
[{'content': 'Which of the following condition is diagnosed using a positive urinary anion gap? \nSelect and explain. \nA. Acidosis in Diarrhea, B. Diabetic ketoacidosis, C. Alcoholic ketoacidosis, D. Renal tubular Acidosis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Positive urinary anion gap is associated with distal A, as the kidney cannot excrete H+ as NH4Cl. The urinary anion gap (Na+ + K- - Cl-) reflects the ability of the kidney to excrete NH4Cl. It is used to differentiate between gastrointestinal and renal causes of hyperchloremic acidosis. In gastrointestinal cause of hyperchloremic acidosis such as in diarrhea, renal acidification remains normal and NH4Cl excretion increases, and the urinary anion gap is negative. Ref: CURRENT Medical Diagnosis and Treatment, 2012,Chapter 21', 'role': 'assistant'}]