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': 'Which lesion displays an ill-defined border? \nSelect and explain. \nA. Periapical cyst, B. Sclerosing osteitis, C. Soft tissue capsule, D. Multiple myeloma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Ill-Defined Borders\nBlending Border: A blending border is a gradual, often wide zone of transition between the adjacent normal bone trabeculae and the abnormal appearing\xa0trabeculae\xa0of\xa0the\xa0lesion.\xa0The\xa0focus\xa0of\xa0this\xa0observation is on the trabeculae and not on the radiolucent marrow\xa0spaces.\nExamples of conditions with this type of margin are sclerosing osteitis\xa0and fibrous dysplasia.\nOral radiology White and Pharaoh; 7th ed. Page no 276,277', 'role': 'assistant'}]