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 local anesthetic is metabolized by liver \nSelect and explain. \nA. Procaine, B. Cocaine, C. Benzocaine, D. Chlorprocaine', 'role': 'user'}, {'content': 'Answer: B \nExplanation: All of the above drugs belong to ester group of local anesthetics. All ester are metabolized in plasma except cocaine which is metabolized in liver.', 'role': 'assistant'}]