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: Anaesthesia
Local anaesthetics act by 
Select and explain. 
A. Effecting the spinal level, B. Effecting the Na+ channel, C. Effecting the K+ channel, D. Blocking axonal transpo
B: Effecting the Na+ channel
Answer: B: Effecting the Na+ channel 
Explanation: Effecting the Na+ channel