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': "Metabolic alkalosis seen in following except - \nSelect and explain. \nA. Methanol poisoning, B. Cushing's disease, C. Vomiting, D. Diuretic therapy", 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]