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': 'Which of the following local anesthetics is useful for topical administration only? \nSelect and explain. \nA. Procaine, B. Bupivacaine, C. Etidocaine, D. Benzocaine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: .', 'role': 'assistant'}]