This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal system, Subject name: Radiology
Floating teeth sign is seen in 
Select and explain. 
A. Metastasis, B. Osteitis fibrosa, C. Histiocytosis, D. Asbestosis
C: Histiocytosis
Answer: C: Histiocytosis 
Explanation: Radiological features of Langerhans cell histiocytosis : Punched out lytic lesions of skull with bevelled edges. Geographic skull. Floating teeth sign due to radiolucent lesion around the teeth. Veebra plana