This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bone Tumour, Subject name: Orthopaedics
Commonest malignancy of bones is - 
Select and explain. 
A. Ewings sarcoma, B. Metastases, C. Multiple myeloma, D. Osteogenic sarcoma
B: Metastases
Answer: B: Metastases 
Explanation: Ans. is 'b' i.e., Metastases Important facts* Commonest bone malignancies Secondaries (metastases)* Commonest primary malignant tumor-Multiple myeloma* Commonest primary malignant tumor o long bones-Osteosarcoma* Commonest benign tumor of bonne-Osteochondroma(Osteochondroma is not ture neoplasm since its growth stops with cessation of growth at the epiphyseal plate)* Commonest true benign tumor of bone-Osteroid osteoma* Commonest benign tumor of hand-Enchondroma