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
Local anaesthetic acting for more than 2 hrs – a) Bupivacianeb) Etodocainec) Lignocained) Cholorprocaine 
Select and explain. 
A. ac, B. ab, C. ad, D. bc
B: ab
Answer: B: ab 
Explanation: None