This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplastic disorders of WBCs, 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: DISCUSSING THE OPTIONS ONE BY ONE: a. Peak incidence less than 3 years of age - True; More common and more severe in younger children b. Radiosensitive -True - as Bone lesions & Pituitary lesions causing DI, respond well to radiotherapy c. Diffuse form is known as Letterer-siwe disease -True d. Gonadal involvement occurs - False; Gonadal involvement is usually not seen in LCH. - Involvement of bones, scalp, pituitary, lungs, hematopoiesis is seen', 'role': 'assistant'}]