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': 'Of the following Local anesthetics, which has\nintrinsic vasoconstrictive action? \nSelect and explain. \nA. Cocaine, B. Procaine, C. Xylocaine, D. Bupivacaine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]