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': 'Which of the following is the order of activation after stimulation of Purkinje fibers is \nSelect and explain. \nA. Septum → Endocardium → Epicardium, B. Endocardium → Septum → Epicardium, C. Epicardium → Septum → Endocardium, D. Septum → Epicardium → Endocardium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Order of depolarization in the heart.\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 First- Left side of interventricular septum\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Moves to right across the mid-portion of the septum\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Apex of heart\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Along ventricular walls to AV groove (Endocardium to epicardium)\n-\xa0\xa0\xa0\xa0\xa0\xa0\xa0 Last- Posterobasal portion of the left ventricle, pulmonary conus, uppermost portion of the septum.', 'role': 'assistant'}]