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: Unknown
[{'content': 'Most common cause of metabolic acidosis in anaesthesia is: \nSelect and explain. \nA. Hypoventilation, B. Renal failure, C. Hypotension, D. Ketoacidosis', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Hypotension (shock) causes tissue hypoxia leading to production of lactic acid and this lactic acidosis is th6 most common cause of metabolic acidosis seen during anaesthesia.', 'role': 'assistant'}]