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 of the following local anaesthetics belongs to the ester group? 
Select and explain. 
A. Procaine, B. Bupivacaine, C. Lignocaine, D. Mepivacaine
A: Procaine
Answer: A: Procaine 
Explanation: Procaine belongs to ester group. Since Ester links are more prone for hydrolysis than amide links generally esters have a shoer duration of action. Other three are amide group. From padmaja 4th edition Page no 199