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
Distribution of blood flow in mainly regulated by the: 
Select and explain. 
A. Aeries., B. Aerioles., C. Capillaries., D. Venules
B: Aerioles.
Answer: B: Aerioles. 
Explanation: B i.e. Aerioles