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: Surgery
Most commonly used local anesthesia 
Select and explain. 
A. 1:20,000 xylocaine Hcl, B. 1:50,000 xylocaine Hcl, C. 1:10,000 xylocaine Hcl, D. 1:80,000 xylocaine Hcl
D: 1:80,000 xylocaine Hcl
Answer: D: 1:80,000 xylocaine Hcl 
Explanation: None