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: Anaesthesia
Most cardiotoxic local anesthetic ? 
Select and explain. 
A. Procaine, B. Bupivacaine, C. Cocaine, D. Lidocaine
B: Bupivacaine
Answer: B: Bupivacaine 
Explanation: Ans. is 'b' i.e., Bupivacaine