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': 'Which of the following local anaesthetics is most likely to produce an allergic reaction – \nSelect and explain. \nA. Prilocaine, B. Ropivacaine, C. Etidocaine, D. Benzocaine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: There is high incidence of allergic reaction with ester local anesthetics because of para-aminobenzoic acid.\nAmongst the given options only benzocaine is an ester.', 'role': 'assistant'}]