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
A 2-year-old child comes with ear discharge, seborrheic dermatitis, polyuria and hepatosplenomegaly. Which of the following is the most likely diagnosis? 
Select and explain. 
A. Leukemia, B. Lymphoma, C. Langerhan's cell histiocytosis, D. Germ cell tumor
C: Langerhan's cell histiocytosis
Answer: C: Langerhan's cell histiocytosis 
Explanation: c. Langerhan's cell histiocytosis(Ref: Nelson's 20/e p 2484-2489], Ghai 8/e p 620-623)Seborrheic dermatitis, polyuria, hepatosplenomegaly and ear discharge suggests diagnosis of LCH.