This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: General physiology, Subject name: Physiology
True about relative refractory period is: 
Select and explain. 
A. Response can't be generated at all, B. Due to closure of inactive gates of sodium channals, C. Due to opening of potassium channals, D. All
C: Due to opening of potassium channals
Answer: C: Due to opening of potassium channals 
Explanation: Stronge stimulus can produce response in relative refractory period Cause: it is because potassium channals are open and the membrane potential is more close to resting membrane Begins after the end of absolute refractory period Ref:Guyton and Hall textbook of medical physiology 12th edition,page number: 70