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
The potential action of all the local anesthetics depends on the ability of anesthetic salt to liberate the free 
Select and explain. 
A. Acid medium, B. Neutral medium, C. Alkaloidal chelate, D. Alkaloidal base
D: Alkaloidal base
Answer: D: Alkaloidal base 
Explanation: None