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': 'Positive urinary anion gap is found in- \nSelect and explain. \nA. Alcholic ketoacidosis, B. Diabetic ketoacidosis, C. Renal tubular acidosis, D. Diarrhea', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Urinary anion gap : used to differentiate GIT causes from Renal causes. UAG= Urine anions - urine cations =( HCO3-) - (NH4+) NORMAL = 0 In GIT cause : NEGATIVE In Renal cause : POSITIVE Ref: Harrison&;s 19thE', 'role': 'assistant'}]