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
Local anaesthetic with prolonged action 
Select and explain. 
A. Procaine, B. Cocaine, C. Lidocaine, D. Dibucaine
D: Dibucaine
Answer: D: Dibucaine 
Explanation: Dibucaine is the longest acting local anaestheticChlorprocaine is the shoest acting local anaestheticDecreasing order of duration: Dibucaine >Bupivacine= Tetracaine = Ropivacaine=Etidocaine > Prilocaine = lignocaine =Mepivacaine = Cocaine >Procaine >Chloprocaine(Refer: stoelting's pharmacology and physiology in anaesthetic practice, 5th edition, pg no.290,304)