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 of the following is used as epidural anaesthetic agent commonly? \nSelect and explain. \nA. Chloroprocaine, B. Lidocaine, C. Mepivacaine, D. All of the above', 'role': 'user'}, {'content': "Answer: D \nExplanation: Commonly used sho- to intermediate-acting agents for epidural anesthesia include, Chloroprocaine Lidocaine Mepivacaine Longer acting agents include, Bupivacaine Levobupivacaine Ropivacaine Ref: Butterwoh IV J.F., Butterwoh IV J.F., Mackey D.C., Wasnick J.D., Mackey D.C., Wasnick J.D. (2013). Chapter 45. Spinal, Epidural, & Caudal Blocks. In J.F. Butterwoh IV, J.F. Butterwoh IV, D.C. Mackey, J.D. Wasnick, D.C. Mackey, J.D. Wasnick (Eds), Morgan & Mikhail's Clinical Anesthesiology, 5e.", 'role': 'assistant'}]