This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Disorder of Metabolism & Connective Tissue, Subject name: Medicine
Causes of high anion-gap metabolic acidosis include the following EXCEPT 
Select and explain. 
A. Diarrhea, B. Starvation, C. Diabetic ketoacidosis, D. Salicylate poisoning
A: Diarrhea
Answer: A: Diarrhea 
Explanation: Ans. a (Diarrhea) (Ref. H - 18th/pg. ch. 47)ANION GAP# The anion gap may be calculated by using (sodium + potassium) - (bicarbonate + chloride)# Normal =10-12 mmol/L# Causes of a normal anion gap or hyperchloraemic metabolic acidosis- Gastrointestinal bicarbonate loss: diarrhea, ureterosigmoidostomy, fistula- Renal tubular acidosis- Drugs: e.g., acetazolamide- Ammonium chloride injection- Addison's disease# Causes of a raised anion gap metabolic acidosis- Lactate: shock, hypoxia- Ketones: diabetic ketoacidosis, alcohol- Urate: renal failure- Acid poisoning: salicylates, methanolAlso know:Ethylene glycol, methanol, and isopropyl alcohol - all cause an elevated osmolal gap, but only the first two cause a high- AG acidosis.