This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Pharmacology
[{'content': 'Which among the following is the most cardiotoxic LA: \nSelect and explain. \nA. Dibucaine, B. Bupivacaine, C. Prilocaine, D. Lignocaine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Bupivacaine induced cytotoxicity is enhanced by acidosis, hypercarbia, hypoxemia.', 'role': 'assistant'}]