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
Percentage of lignocaine use for spinal anaesthesia is: 
Select and explain. 
A. 0.50%, B. 5%, C. 2.50%, D. 2%
B: 5%
Answer: B: 5% 
Explanation: 5% lignocaine is used for spinal anaesthesia. Also know: Percentage of lignocaine used for: IV regional anaesthesia - 0.5% Nerve block - 1% Epidural / Jelly - 2% Topical - 4% Spinal - 5% Ref: Morgan's 4th / pg. 270, KDT 6th / pg. 357.