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
Repolarization in isolated muscle piece fibre proceeds from: 
Select and explain. 
A. Epicardium to endocardium, B. Endocardium to epicardium, C. Left to right, D. Right to left
B: Endocardium to epicardium
Answer: B: Endocardium to epicardium 
Explanation: None