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: Anaesthesia
[{'content': 'Which one of the following local anaesthetic is highly cardiotoxic – \nSelect and explain. \nA. Lignocaine, B. Procaine, C. Mepivacaine, D. Bupivacaine', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Bupivacaine is the most cardiotoxic local anaesthetic.', 'role': 'assistant'}]