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
The main cause of increased blood flow to exercising muscles is : 
Select and explain. 
A. Raised blood pressure, B. Vasodilatation due to local metabolites, C. Increased sympathetic discharge to peripheral vessels, D. Increased hea rate
B: Vasodilatation due to local metabolites
Answer: B: Vasodilatation due to local metabolites 
Explanation: B i.e. Vasodilatation due to local metabolites