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
Which of the following local anesthetic is metabolized by liver 
Select and explain. 
A. Procaine, B. Cocaine, C. Benzocaine, D. Chlorprocaine
B: Cocaine
Answer: B: Cocaine 
Explanation: 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.