This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Regional Anesthesia, Subject name: Anaesthesia
[{'content': 'Which of the following local anesthetic is amide : \nSelect and explain. \nA. Lidocaine, B. Procaine, C. Chloroprocaine, D. Cocaine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Lidocaine is an amino amide local anaesthetic. Metabolized by microsomal P-450 enzymes in the liver. cocaine , proacaine and chloroprocaine are sho acting amino ester local anesthetic.', 'role': 'assistant'}]