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
[{'content': 'Most cardiotoxic local anesthetic \nSelect and explain. \nA. Procaine, B. Bupivacaine, C. Cocaine, D. Lidocaine', 'role': 'user'}, {'content': "Answer: B \nExplanation: Bupivacaine is the most cardiotoxic LA (Ropivacaine is a newer bupivacaine congenial with less cardiotoxicity).(Refer: stoelting's pharmacology and physiology in anaesthetic practice, 5th edition, pg no.294)", 'role': 'assistant'}]