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': 'Local anaesthesia which is most cardiotoxic is: \nSelect and explain. \nA. Procaine, B. Prilocaine, C. Bupivicaine, D. Ropivacaine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Bupivicaine', 'role': 'assistant'}]