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
The longest acting local anesthetics - 
Select and explain. 
A. Bupivacaine, B. Ropivacaine, C. Dibucaine, D. Tetracaine
C: Dibucaine
Answer: C: Dibucaine 
Explanation: long acting ester local anesthetic -Benzocaine . tetracaine long acting amide local anesthetic- bupivacaine, ropivacaine , levobupivacaine , dibucaine overall longest acting local anesthetic- Dibucaine- Tetracaine- Bupivacaine