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': 'The renal threshold for glucose is: \nSelect and explain. \nA. 180 mg / dl, B. 100 mg /dl, C. 120 mg / dl, D. 80 mg / dl', 'role': 'user'}, {'content': 'Answer: A \nExplanation: None', 'role': 'assistant'}]