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
After hyperpolarisation phase of the action potential is due to 
Select and explain. 
A. An outward calcium current, B. An inward chloride current, C. An outward potassium current, D. An outward sodium current
C: An outward potassium current
Answer: C: An outward potassium current 
Explanation: After hyperpolarisation Phase : Part of action potential below RMP
It is due to slow return of K+ channels to closed