This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Conducting System of Hea, Subject name: Physiology
[{'content': 'Among the following, the last pa of the ventricle to be depolarized: \nSelect and explain. \nA. Epicardium of the base of LV, B. Endocardium of the base of LV, C. Apical epicardium, D. Apical endocardium', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Depolarization spreads from apex to base and from endocardium to epicardium. Thus, last pa of the hea to be depolarized is: epicardium of the base of the LV. The other pas where depolarization reaches last: pulmonary conus, uppermost pa of interventricular septum.', 'role': 'assistant'}]