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: Unknown
Percentage of Xylocaine used in spinal anesthesia- 
Select and explain. 
A. 1%, B. 2%, C. 4%, D. 5%
D: 5%
Answer: D: 5% 
Explanation: Ans - D