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
Longest acting local anaesthetic is: March 2013 (e, h) 
Select and explain. 
A. Procaine, B. Lignocaine, C. Bupivacaine, D. All of the above
C: Bupivacaine
Answer: C: Bupivacaine 
Explanation: Ans. C i.e. Bupivacaine Bupivacaine Amide with duration of action more than 2 hours, C/I for: Bier's block/Intravenous regional anaesthesia/IVRA It is highly cardiotoxic Cardiotoxicity is not easily reversible, Levo-bupivacaine is used by epidural/intrathecal route