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
Local anaesthetic with prolonged action ? 
Select and explain. 
A. Procaine, B. Cocaine, C. Lidocaine, D. Dibucaine
D: Dibucaine
Answer: D: Dibucaine 
Explanation: 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 .