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
[{'content': 'Repolarization in isolated muscle piece fibre proceeds from: \nSelect and explain. \nA. Epicardium to endocardium, B. Endocardium to epicardium, C. Left to right, D. Right to left', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]