This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anaesthesia
[{'content': 'Eutectic mixture of local anaesthetic (EMLA) cream is \nSelect and explain. \nA. Bupivacaine 2.0 + Prilocaine 2.5%, B. Lidocaine 2.5%+Prilocaine 2.5%, C. Lidocaine 2.5% + Prilocaine 5%, D. Bupivacaifne 0.5% + Lidocaine 2.55', 'role': 'user'}, {'content': "Answer: B \nExplanation: Eutectic mixture of local anaesthetic (EMLA)This is unique topical preparation which can anaesthetize the intact skinIt is a mixture of 2.5% lidocaine and 2.5 prilocaineIt acts slowly and the cream must head in contact with the skin for at least 1 hourEMLA is used: to make venepuncture painless especially for children, and for the procedure like skin grafting & circumcisionAs systemic absorption of prilocaine can cause methemoglobinemia, EMLA should not be used on the mucocutaneous membrane or in very small child.(Refer: Morgan and Mikhail's Clinical Anaesthesiology, 5th edition, pg no. 754, 856)", 'role': 'assistant'}]