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: Physiology
In excitable cells, repolarization is closely associated with one of the following events: 
Select and explain. 
A. Na+ efflux, B. Na+ influx, C. K+ efflux, D. K+ influx
C: K+ efflux
Answer: C: K+ efflux 
Explanation: None