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
Which of the following is the order of activation after stimulation of Purkinje fibers is 
Select and explain. 
A. Septum → Endocardium → Epicardium, B. Endocardium → Septum → Epicardium, C. Epicardium → Septum → Endocardium, D. Septum → Epicardium → Endocardium
A: Septum → Endocardium → Epicardium
Answer: A: Septum → Endocardium → Epicardium 
Explanation: Order of depolarization in the heart.
-        First- Left side of interventricular septum
-        Moves to right across the mid-portion of the septum
-        Apex of heart
-        Along ventricular walls to AV groove (Endocardium to epicardium)
-        Last- Posterobasal portion of the left ventricle, pulmonary conus, uppermost portion of the septum.