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: Radiology
CT scan of a patient with history of head injury shows a biconvex hyperdense lesion displacing the grey–white matter interface. The most likely diagnosis is 
Select and explain. 
A. Subdural hematoma, B. Diffuse axonal injury, C. Extradural hematoma, D. Hemorrhagic contusion
C: Extradural hematoma
Answer: C: Extradural hematoma 
Explanation: Biconvex hyperdense lesion on CT after a head injury suggest the diagnosis of epidural (extradural) hematoma.