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 2-year-old child comes with discharge, seborrheic dermatitis, polyuria and hepatosplenomegaly. Which of the following is the most likely diagnosis - \nSelect and explain. \nA. Leukemia, B. Lymphoma, C. Langerhan's cell histiocytosis, D. Germ cell tumour", 'role': 'user'}, {'content': 'Answer: C \nExplanation: None', 'role': 'assistant'}]