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
[{'content': 'If Renal Blood flow is 1250 ml / min. Calculate renal plasma flow ________ \nSelect and explain. \nA. 690  ml / min, B. 650  ml / min, C. 710  ml / min, D. 670  ml / min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Renal Blood flow = 1250 ml / min\n(Plasma = 100 - pcv)\nIn blood, by hemoatocrt, pcv = 45%, plasma = 55%\nRenal plasma flow\n= Renal blood flow\xa0\xa0× % of plasma\n= 1250\xa0× 55%\n= 687.5 ml / min\n= 690 ml / min', 'role': 'assistant'}]