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
An ill-defined lesion margin is described as: 
Select and explain. 
A. Sclerotic, B. Blending, C. Corticated, D. Punched out
B: Blending
Answer: B: Blending 
Explanation: Ill-Defined Borders:
Blending Border: A blending border is a gradual, often wide zone of transition between the adjacent normal bone trabeculae and the abnormal-appearing trabeculae of the lesion.
Oral radiology White and Pharaoh; 7th ed. Page no 276