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': 'Which of the following appears hyperdense on CT? \nSelect and explain. \nA. Air, B. Water, C. Fat, D. Acute bleed', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Acute Bleed is Hyperdense on CT as it have +70 HU Coical Bone +400 to +1000 Calcifications +200 to +250 Contrast agents +130 Hu Acute Bleed +60 to +70 Hu CSF/Water 0 Fat - 50 to -100 Hu AIR -1000 Hu Acute ICH in right frontal lobe.', 'role': 'assistant'}]