This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous system, Subject name: Physiology
If the blood flow through a blood vessel is 2 ml/min, how much will it become if its radius is doubled 
Select and explain. 
A. Will remain the same, B. 4 ml/min, C. 8 ml/min, D. 16 ml/min
D: 16 ml/min
Answer: D: 16 ml/min 
Explanation: According to poiseuille equation Flow rate is directly propoional to radius to the power of 4 Ref: guyton and hall textbook of medical physiology 12 edition page number:220,221,222