This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
Localised Langerhans cells histiocytosis affecting head and neck is 
Select and explain. 
A. Letterer-Siwe disease, B. Pulmonary Langerhans cell histiocytosis, C. Hand-Schuller-Christian disease, D. Eosinophilic granuloma
D: Eosinophilic granuloma
Answer: D: Eosinophilic granuloma 
Explanation: d. Eosinophilic granuloma(Ref: Nelson's 20/e p 2484-2489, Ghai 8/e p 620-623)Eosinophilic granuloma: Bone lesions, with no visceral involvement; Localised; affects head and neck