This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Misc., Subject name: Physiology
The per cent of fluid present in arterial system is 
Select and explain. 
A. 85%, B. 15%, C. 30%, D. 50%
A: 85%
Answer: A: 85% 
Explanation: (A) 85% > An average value is 3500 mL (5% of the body weight of a 70 kg man, assuming unit density)approx.70%-80%.