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
[{'content': 'The per cent of fluid present in arterial system is \nSelect and explain. \nA. 85%, B. 15%, C. 30%, D. 50%', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) 85% > An average value is 3500 mL (5% of the body weight of a 70 kg man, assuming unit density)approx.70%-80%.', 'role': 'assistant'}]