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
Secondary aneurysmal bone cyst arises in - 
Select and explain. 
A. Osteoclastoma, B. Chondroblastoma, C. Fibrous dysplasia, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Most of the time (80%) aneurysmal bone cyst is primary, and no other pathology is found.
Secondary aneurysmal bone cysts (20%) occurs when bone changes of aneurysmal bone cyst occur in a pre-existing lesion:-


Giant cell tumors (osteoclastoma) : - Most common      
Osteoblastoma 
Simple bone cyst
Non-ossifying fibroma  
Telangiectatic osteosarcoma
Metastasis
Fibrous dysplasia
Paget's disease
 Chondromyxoid fibroma
Chondroblastoma