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
Which of the following concentration of lignocaine is used in epidural anaesthesia? 
Select and explain. 
A. 5%, B. 0.50%, C. 2%, D. 4%
C: 2%
Answer: C: 2% 
Explanation: 1-2% lignocaine with or without adrenaline is used in epidural anaesthesia. Lignocaine in the concentration of 0.5 - 1 % is used for local infiltration anaesthesia. For surface application 4% lignocaine is used as a liquid or 5% as a gel. Reference: Textbook of Anaesthesia for Post Graduates By T.K Agasti, page 337