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
Longest acting LA is ? 
Select and explain. 
A. Bupivacaine+ Etidocaine, B. Bupivacaine + lignocaine, C. Procaine + lidocaine, D. Bupivacaine + mepivacaine
A: Bupivacaine+ Etidocaine
Answer: A: Bupivacaine+ Etidocaine 
Explanation: Half life order - Bupivacaine> Etidocaine> Mepivacaine> Lignocaine.
Same will be the order of duration of action.