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 anaesthesia acts by – 
Select and explain. 
A. Na+channel inhibition, B. Ca++ channel inhibition, C. Mg++ channel inhibition, D. K+ channel inhibition
A: Na+channel inhibition
Answer: A: Na+channel inhibition 
Explanation: Local anesthetics act by inhibiting Na+ channels from inside.