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: Surgery
[{'content': 'Radiographic finding of floating teeth can be seen in ? \nSelect and explain. \nA. Ectodermal dysplasis, B. Cleido cranial dysplasia, C. Osteopetrosis, D. Histiocytosis - X', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is 'd' i.e., Histiocytosis X", 'role': 'assistant'}]