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: Medicine
[{'content': 'According to Misch bone density classification D2 is \nSelect and explain. \nA. > 1250 Hounsfield units, B. 350 — 850 Hounsfield units, C. 850 — 1250 Hounsfield units, D. 150 — 350 Hounsfield units', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]