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: Pathology
All are histicytosis except - 
Select and explain. 
A. Letter seiwe syndrome, B. Chloroma, C. Handschuller-christian triad, D. Eosinophilic granuloma
B: Chloroma
Answer: B: Chloroma 
Explanation: Ans. is 'b' i.e., Chloroma