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: Orthopaedics
Osteoporosis is seen in 
Select and explain. 
A. Tumer's syndrome, B. Klinefelter's syndrome, C. Cushing's syndrome due to steroids, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None