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': 'Local anaesthetic with prolonged action ? \nSelect and explain. \nA. Procaine, B. Cocaine, C. Lidocaine, D. Dibucaine', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Dibuca Dibucaine is the longest acting local anaesthetic Chlorprocaine is the shoest acting local anaesthetic Decreasing order of duration : - Dibucaine > Bupivacine = Tetracaine = Ropivacaine = Etidocaine > Prilocaine = Lignocaine = Mepivacaine = Cocaine > Procaine > Chlorprocaine .", 'role': 'assistant'}]