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': 'What is the net urea reabsorption rate? \nSelect and explain. \nA. 0 mg/min, B. 25 mg/min, C. 50 mg/min, D. 75 mg/min', 'role': 'user'}, {'content': 'Answer: D \nExplanation: The net urea reabsorption rate is equal to the ﬁltered load of urea (GFR  x plasma urea\xa0concentration ) - urinary excretion rate of urea (urine urea concentration  x\xa0 urine ﬂow rate ). \u200b\nTherefore, net urea reabsorption = (50 mL/min x 2.5 mg/mL) – (50\xa0mg/mL x 1 mL/min) = 75 mg/min.', 'role': 'assistant'}]