This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Tumors, Subject name: Ophthalmology
[{'content': 'The diagnostic triad of exophthalmos, diabetes insipidus and bone lesions is characteristic of \nSelect and explain. \nA. Fibrous dysplasia, B. Letterer-Sieve disease, C. Osteoporosis, D. Hand-Schuller Christian disease', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Hand-Schuller-Christian disease: It is a chronic disseminated form of histiocytosis involving both soft tissues and bones in older children of either sex. It is characterised by a triad of proptosis, diabetes insipidus and bony defects in the skull. Ref:- A K KHURANA; pg num:-397', 'role': 'assistant'}]