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: Pharmacology
The most potent and longest acting anaesthetic agent is : 
Select and explain. 
A. Dibucaine, B. Tetracaine, C. Bupivacaine, D. Lignocaine
A: Dibucaine
Answer: A: Dibucaine 
Explanation: None