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: Pharmacology
Most cardiotoxic local anaesthetic agent 
Select and explain. 
A. Bupivacaine, B. Ropivacaine, C. Dibucaine, D. Levobupivacaine
A: Bupivacaine
Answer: A: Bupivacaine 
Explanation: Bupivacaine is more prone to prolong QTc interval and induce ventricular tachycardia or cardiac depression should not bbe used for intravenous regional analgesia (Bier's). Levobupivacaine is equally potent but less cardiotoxic and less prone to cause seizures then bupivacaine. Ref Katziung 12th ed