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': "All are used for Bier's block except \nSelect and explain. \nA. Lidocaine, B. Prilocaine, C. Dibucaine, D. Chlorprocaine", 'role': 'user'}, {'content': "Answer: C \nExplanation: Ans. is 'c' i.e., Dibucaine", 'role': 'assistant'}]