This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional anaesthesia, Subject name: Anaesthesia
[{'content': 'Local anaesthesia causing methemoglobineinia - \nSelect and explain. \nA. Procaine, B. Prilocaine, C. Etodicaine, D. Ropivacaine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: O-toludine metabolites of prilocaine accumulate after large dose of drug conve hemoglobin to methemoglobin lead to methemoglobulinemia, dose depndent(range of 10mg/kg) Treatment of methemoglobinemia is IV methylene blue Benzocaine also cause methemoglobinemia', 'role': 'assistant'}]