This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: CT SCAN, Subject name: Radiology
[{'content': 'Hounsfield unit of 200-250 in CT indicates \nSelect and explain. \nA. Fat, B. Calcifications, C. Acute bleed, D. CSF', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The reference value for Hounsfield unit is 0 - seen with CSF or Water HU of (-50) - (-100) is seen with fat HU of (-1000) is seen with air Appears hypodense HU of +60 to +70 - Acute bleed HU of +130 - Contrast HU of +200 to +250 - Calcifications HU of +400 to +1000 -Coical bone Appears hyperdense', 'role': 'assistant'}]