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': 'L.A. causing Meth Haemoglobinemia \nSelect and explain. \nA. Procaine, B. Prilocaine, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Prilocaine', 'role': 'assistant'}]