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': 'Shoest acting local anesthetic agent is \nSelect and explain. \nA. Procaine, B. Lidocaine, C. Tetracaine, D. Bupivacaine', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Classification Amide type Long acting * Bupivacaine * Levo-Bupivacaine * Ropivacaine * Dibucaine Intermediate acting * Lidocaine (lignocaine) * Mepivacaine * Prilocaine * Aicaine Ester type Long acting * Tetracaine (amethocaine) Intermediate acting * Cocaine Sho acting * Procaine * Chloroprocaine * Benzocaine * Proparacaine i.e. Procaine Ref: willer 10th ed.', 'role': 'assistant'}]