This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S., Subject name: Pediatrics
[{'content': 'About Langerhans cell histiocytosis, true are all except: \nSelect and explain. \nA. Peak incidence less than 3 years of age, B. Radiosensitive, C. Diffuse form is known as Letterer-Siwe-disease, D. Gonadal involvement occurs', 'role': 'user'}, {'content': "Answer: D \nExplanation: d. Gonadal involvement occurs(Ref: Nelson's 20/e p 2484-2489; Ghai 8/e p 620-623)a. Peak incidence less than 3 years of age: True; More common and more severe in younger childrenb. Radiosensitive: True, as Bone lesions and Pituitary lesions, causing DI, respond well to radiotherapyc. Diffuse form is known as Letterer-Siwe disease: Trued. Gonadal involvement occurs: FALSE; Gonadal involvement is usually not seen in LCH.", 'role': 'assistant'}]