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
The diagnostic triad of exophthalmos, diabetes insipidus and bone lesions is characteristic of: 
Select and explain. 
A. Hand-Schuller Christian disease, B. Letterer-Sieve disease, C. Fibrous dysplasia, D. Osteoporosis
A: Hand-Schuller Christian disease
Answer: A: Hand-Schuller Christian disease 
Explanation: Ans. Hand-Schuller Christian disease