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
LA acts on nerve membrane by: 
Select and explain. 
A. Blocking conductance of Na+ from interior to exterior, B. Blocking conductance of Na+ from exterior to interior, C. Blocking conductance of K+ from interior to exterior, D. Blocking conductance of K+ from exterior to interior
B: Blocking conductance of Na+ from exterior to interior
Answer: B: Blocking conductance of Na+ from exterior to interior 
Explanation: None