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
Most cardiotoxic local anaesthetic is : 
Select and explain. 
A. Procaine, B. Bupivacaine, C. Prilocaine, D. Tetracaine
B: Bupivacaine
Answer: B: Bupivacaine 
Explanation: None