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
Which of the following increases turbulence in blood flow? 
Select and explain. 
A. Reynolds number< 2000, B. Decrease in velocity of blood, C. Decrease in density of blood, D. Increase in diameter of blood vessel
D: Increase in diameter of blood vessel
Answer: D: Increase in diameter of blood vessel 
Explanation: None