This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous (Local and Regional Anesthesia), Subject name: Anaesthesia
Longest acting local anesthetic agent is - 
Select and explain. 
A. Procaine, B. Lidocaine, C. Prilocaine, D. Dibucaine
D: Dibucaine
Answer: D: Dibucaine 
Explanation: Ans. is 'd' i.e., Dibucaine Local Anesthetic agentsShort duration(< 30 min)Low potencyIntermediate duration (30-90 min)Intermediate potencyLong duration (> 120 min) High potencyChlorprocaine (shortest acting)LignocaincMepivacaineBupivacaineTetracaineProcainePrilocaineCocaineEtodicaineRopivacaineDibucaine (longest acting)