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
Perfusion pressure is 
Select and explain. 
A. Arterial pressure, B. Venous pressure, C. Arterial–venous pressure difference, D. Pressure in left ventricle
C: Arterial–venous pressure difference
Answer: C: Arterial–venous pressure difference 
Explanation: Perfusion pressure is arterial pressure minus venous pressure.