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': 'LA causing cutaneous vasoconstriction: \nSelect and explain. \nA. Lidocaine., B. Ropivacaine., C. Mepivacaine., D. Procaine.', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]