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
Hyperparathyroidism causes - 
Select and explain. 
A. Multiple bone cysts, B. Subperiosteal bone resorption, C. Brown's tumor, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Radiological features of bone are : Rarefaction of bones, salt pepper skull, loss of lamina dura, sub-periosteal resorption of bone, multiple cysts, Brown's tumor, and collapse of vertebrae with biconvex disc.