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
Most cardiotoxic local anaesthetic: 
Select and explain. 
A. Dibucaine, B. Bupivacaine, C. Lignocaine, D. Chlorprocaine
B: Bupivacaine
Answer: B: Bupivacaine 
Explanation: Ans: (b) BupivacaineRef: KDT 6th ed. 1357* Bupivacaine is a local anesthetic agent from Amide group.* It is most cardiotoxic LA.* Shortest acting LA: Chlorprocaine* Longest acting LA: Dibucaine* Most commonly used LA: Lignocaine* Local anesthetic which causes methhemoglobinemia: Prilocaine