This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cardiovascular system, Subject name: Physiology
Mean circulatory filling pressure is 
Select and explain. 
A. Difference between systemic and pulmonary aerial pressure, B. Difference between central venous pressure and central aerial pressure, C. Mean atrial pressure, D. Aerial pressure taken at the point when hea stops beating
D: Aerial pressure taken at the point when hea stops beating
Answer: D: Aerial pressure taken at the point when hea stops beating 
Explanation: When hea pumping is stopped by shocking the hea with electricity to cause ventricular fibrillation or is stopped in any other way, flow of blood anywhere in circulation ceases a few seconds later. Without blood flow the pressure everywhere in circulation become equal. This equilibrated pressure level is called mean circulatory filling pressureRef: Guyton and Hall, Textbook of medical physiology, 2ndSouth Asia Edition