This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: FMGE 2017, Subject name: Anaesthesia
[{'content': 'Which of the following local anesthetics causes methemoglobinemia:- \nSelect and explain. \nA. Lignocaine, B. Benzocaine, C. Chloroprocaine, D. Dibucaine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Methemoglobinemia * Benzocaine * Prilocaine * EMLA Cream (Lignocainee + Prilocaine) Physiologically Iron in Hb is Fe2+ If iron in Hb is Fe3+ - Methemoglobin Rx: IV Methylene Blue', 'role': 'assistant'}]