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
Metabolic alkalosis seen in following except - 
Select and explain. 
A. Methanol poisoning, B. Cushing's disease, C. Vomiting, D. Diuretic therapy
A: Methanol poisoning
Answer: A: Methanol poisoning 
Explanation: Methanol is initially metabolized by alcohol dehydrogenase to formaldehyde, with subsequent oxidation to formic acid, then to CO2 & water. Formic acid is responsible for metabolic acidosis with increased anion gap & renal toxicity.