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': 'A 33-year-old man presented with a slowly progressive swelling in the middle third of his right tibia. X-ray examination revealed multiple sharply demarcated radiolucent lesions separated by areas of dense and sclerotic bone. Microscopic examination of a biopsy specimen revealed island of epithelial cells in a fibrous stroma. Which of the following is the most probable diagnosis? \nSelect and explain. \nA. Adamantinoma, B. Osteofibrous dysplasia, C. Osteosarcoma, D. Fibrous coical defect', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Adamantinoma', 'role': 'assistant'}]