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
True about Arterioles is 
Select and explain. 
A. Resistance, B. Exchange, C. Reservoir, D. Pressure
A: Resistance
Answer: A: Resistance 
Explanation: Arterioles regulate the distribution of blood flow by altering their diameter to increase or decrease the peripheral resistance as required.