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: Anaesthesia
Which one of the following local anesthetics belongs to the ester group? 
Select and explain. 
A. Procaine, B. Lignocaine, C. Bupivacaine, D. Mepivacaine
A: Procaine
Answer: A: Procaine 
Explanation: Procaine is an ester linked local anaesthetic. Bupivacaine, Lignocaine and Mepivacaine are amide linked local anesthetics. Other ester linked anesthetics are cocaine, chloroprocaine, tetracine and benzocaine. Ref: Essentials of Medical Pharmacology By K D Tripathi, 5th Edition, Page 320.