This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Wounds, Tissue Repair & Scars, Subject name: Surgery
[{'content': 'A 40-year-old man is found to have severe metabolic acidosis with a high anion gap. What is the most likely cause? \nSelect and explain. \nA. Diarrhea, B. Methanol ingestion, C. Proximal renal tubular acidosis, D. Distal renal tubular acidosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Methanol ingestion results in increased production of lactic acid causing an increased anion gap. The other conditions listed are associated with normal anion gap. Diarrhea, proximal renal tubular acidosis, and ureterosigmoidostomy result in loss of bicarbonate, while distal renal tubular acidosis is associated with decreased acid excretion.', 'role': 'assistant'}]