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
Dose of lignocaine for spinal anesthesia is? 
Select and explain. 
A. 0.50%, B. 2.50%, C. 4%, D. 5%
D: 5%
Answer: D: 5% 
Explanation: 5% REF: Morgan's 4th e p. 270, KDT 6th edition page 357 Concentration of lignocaine can be remembered as "INETS" IV regional anesthesia 0.5% Nerve block 1% Epidural / jelly 2% Topical 4% Spinal 5%