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: Anaesthesia
[{'content': "Local anaesthesia causing metheaEUR' moglobinemia \nSelect and explain. \nA. Procaine, B. Prilocaine, C. Etiodicaine, D. Ropivacaine", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Prilocaine', 'role': 'assistant'}]