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': 'patient has blood glucose of 200 mg / dl, GFR = 90 ml / min, transport maximum for glucose = 150 mg / min. What is the amount of glucose excreted? \nSelect and explain. \nA. 30 mg / min, B. 40 mg / min, C. 20 mg / min, D. 50 mg / min', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Blood glucose\n= 200 mg /dl = 200 mg / 100 ml\n= 2 mg / ml\nFiltered load of glucose\xa0\xa0\n= GFR\xa0× Blood glucose\n= 90\xa0× 2\n= 180 mg/min\nAmount of glucose excreted = Filtered load\xa0–\xa0Transport maximum\n= 180\xa0–\xa0150\n= 30 g/min', 'role': 'assistant'}]