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: Surgery
[{'content': 'Local anesthetic with highest local tissue irritancy is \nSelect and explain. \nA. Procaine, B. Chloroprocaine, C. Lignocaine, D. Bupivacaine agents', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]