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
A 25 year old man has muscle blood flow of 500ml/min. He has mean arterial pressure of 160mmHg and mean venous pressure of 10mmHg of muscle. Calculate vascular resistance of the muscle of this man. 
Select and explain. 
A. 0.3 mmHg/ml/min, B. 0.5 mmHg/ml/min, C. 0.8 mmHg/ml/min, D. 1 mmHg/ml/min
A: 0.3 mmHg/ml/min
Answer: A: 0.3 mmHg/ml/min 
Explanation: None