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
Long acting local anesthetic is – a) Procaineb) Lignocainec) Bupivacained) Etidocaine 
Select and explain. 
A. ab, B. bc, C. cd, D. ac
C: cd
Answer: C: cd 
Explanation: Bupivacaine and Etidocaine are long acting.
Lignocaine is intermediate acting.
Procaine is short acting.