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
[{'content': "A child presents with seborrheic dermatitis, sinusitis and chronically draining ears. On examination child has failure to thrive with hepatosplenomegaly and exophthalmos. Probable diagnosis is \nSelect and explain. \nA. Histiocytosis-X, B. Wegener's granulomatosis, C. Chronic granulomatous disease, D. Chediak-Higashi syndrome", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Histiocytosis-X', 'role': 'assistant'}]