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: Ophthalmology
[{'content': 'The diagnostic triad of exophthalmos, diabetes insipidus and bone lesions is characteristic of: \nSelect and explain. \nA. Hand-Schuller Christian disease, B. Letterer-Sieve disease, C. Fibrous dysplasia, D. Osteoporosis', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. Hand-Schuller Christian disease', 'role': 'assistant'}]