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': 'The longest acting local anesthetics - \nSelect and explain. \nA. Bupivacaine, B. Ropivacaine, C. Dibucaine, D. Tetracaine', 'role': 'user'}, {'content': 'Answer: C \nExplanation: long acting ester local anesthetic -Benzocaine . tetracaine long acting amide local anesthetic- bupivacaine, ropivacaine , levobupivacaine , dibucaine overall longest acting local anesthetic- Dibucaine- Tetracaine- Bupivacaine', 'role': 'assistant'}]