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: Surgery
The longest acting, most potent and most toxic LA is: 
Select and explain. 
A. Lidocaine, B. Dibucaine, C. Bupivacaine, D. Tetracaine
B: Dibucaine
Answer: B: Dibucaine 
Explanation: None