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: Pathology
[{'content': 'Langerhans cell histiocytosis true is all except - \nSelect and explain. \nA. Peak incidence less than 3 years of age, B. Radiosensitive, C. Diffuse form is known as litterer-siwe-disease, D. Gonadal involvement occurs', 'role': 'user'}, {'content': 'Answer: D \nExplanation: None', 'role': 'assistant'}]