This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Anatomy
Regulation of blood flow is maintained by 
Select and explain. 
A. Aeries, B. Venules, C. Capillaries, D. Aerioles
D: Aerioles
Answer: D: Aerioles 
Explanation: (Refer: Ganong's Review of Medical Physiology 24thedition, pg no: 570-572, 577)