<prompt> Condition which does not cause metabolic acidosis:-Renal failureUreterosigmoidostomyPancreatic or biliary fistulaPyloric stenosis  <response>: Hyperophic pyloric stenosis causes hypokalemia, hypochloremia metabolic alkalosis with paradoxical aciduria. CAUSES OF NON-ANION GAP ACIDOSIS Mnemonic- USED CARP U-Ureteraldiversion S-Small Bowel Fistula E-Extra Chloride ammonium chloride, Calcium Chloride D-Diarrhea C-Carbonic anhydrase inhibitors Acetazolamide, Mefenamic acid A-Adrenal Insufficiency R-Renal Tubular Acidosis P-Pancreatic Fistula CAUSES OF NORMAL-ANION GAP ACIDOSIS Mnemonic- MUD PILERS M Methanol, Metformin U Uremia D Diabetic Ketoacidosis DKA, Alcoholic Ketoacidosis or Starvation Ketosis P Paraldehyde, Phenformin I Iron, Isopropyl Alcohol, and Isoniazid due to Seizures L Lactic Acidosis E Ethylene Glycol, Ethyl Alcohol R Rhabdomyolysis S Salicylates do not miss Chronic Salicylate Poisoning 