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: Medicine
[{'content': 'A child presents with seborrheic dermatits, lytic skull lesions, ear discharge and hepatospleno- megaly, likely diagnosis - \nSelect and explain. \nA. Leukemia, B. Lymphoma, C. Histiocytosis X, D. Multiple myeloma', 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]