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
[{'content': 'Characteristic of subdural hematoma is \nSelect and explain. \nA. Convex Hyperdensity, B. Concavo convex Hyperdense, C. Biconvex hyperdense, D. Concavo convex hypodense', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. Concave Convex hyperdense', 'role': 'assistant'}]