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: Pediatrics
Baby with recurrent infection of ear & discharge & seborrheic dermatitis with hepatosplenomegaly with cystic skull lesions. Diagnosis is ? 
Select and explain. 
A. Hemophagocytic lymphohistiocytosis, B. Langerhans cell histiocytosis, C. ALL, D. Multiple myeloma
B: Langerhans cell histiocytosis
Answer: B: Langerhans cell histiocytosis 
Explanation: Ans. is 'b' i.e., Langerhans cell histiocytosis