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
[{'content': 'Which one of the following local anesthetics belongs to the ester group? \nSelect and explain. \nA. Procaine, B. Lignocaine, C. Bupivacaine, D. Mepivacaine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: 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.', 'role': 'assistant'}]