This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Anesthesia, Subject name: Pharmacology
Which local anesthetic has a shoer duration of action? 
Select and explain. 
A. Lidocaine, B. Procaine, C. Bupivacaine, D. Ropivacaine
B: Procaine
Answer: B: Procaine 
Explanation: Procaine has least duration among the following. Procaine,Bencocaine,chlorprocaine all of them are sho acting LA. <img class="fr-fic fr-dib" style="width: 300px;" src=" />Ref: Katzung 13e pg: 443