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: Pharmacology
Local anesthetics act by : 
Select and explain. 
A. Affecting at the spinal level, B. Affecting the Na+ channels, C. Affecting the K+channels, D. Blocking axonal transport
B: Affecting the Na+ channels
Answer: B: Affecting the Na+ channels 
Explanation: None