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': 'An ill-defined lesion margin is described as: \nSelect and explain. \nA. Sclerotic, B. Blending, C. Corticated, D. Punched out', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ill-Defined Borders:\nBlending Border:\xa0A blending border is a gradual, often wide zone of transition between the adjacent normal bone trabeculae and the abnormal-appearing\xa0trabeculae\xa0of\xa0the\xa0lesion.\nOral radiology White and Pharaoh; 7th ed. Page no 276', 'role': 'assistant'}]