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 anaesthetics act by inhibiting - 
Select and explain. 
A. Influx of K+, B. Efflux of K+, C. Influx of Na+, D. Efflux of Na+
C: Influx of Na+
Answer: C: Influx of Na+ 
Explanation: Ans. is 'c' i.e., Influx of Na+ The LAs block nerve conduction by decreasing the entry (influx) of Na+ ions during upstroke of action potential.