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 of the following drugs has a high surface local anesthetic activity and intrinsic vasoconstrictor action that reduces bleeding in mucus membrane? \nSelect and explain. \nA. Cocaine, B. Lignocaine, C. Bupivacaine, D. Benzocaine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]