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': 'The following radiograph indicates: \nSelect and explain. \nA. Compact osteoma, B. Cancellous osteoma, C. Both, D. None', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Radiological signs of Osteomas\nThe appearance depends on the type of osteoma. Those arising from compact bone are densely radiopaque and are well defined. Large osteomas may have a\xa0lobulated\xa0appearance.\xa0Osteomas\xa0 arising\xa0from\xa0the\xa0cancellous\xa0bone\xa0have\xa0a trabecular pattern.\nKey Concepts', 'role': 'assistant'}]