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
Concentration of lignocaine used 
Select and explain. 
A. 2%, B. 4%, C. 5%, D. All
D: All
Answer: D: All 
Explanation: A i.e., 2% B i.e., 4% C i.e., 5%