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
Distribution of blood flow in mainly regulated by 
Select and explain. 
A. Aeries, B. Aerioles, C. Capillaries, D. Venules
B: Aerioles
Answer: B: Aerioles 
Explanation: Aerioles are the major site of resistance to the blood flow and small change in their caliber cause large changes in total peripheral resistance, and thereby diastolic pressure is affected. Ref: Ganong's Review of medical physiology, 24th edition.Pg no. 570