This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Metastatic Tumors of Bone, Subject name: Orthopaedics
Commonest malignant tumor of skeletal system - 
Select and explain. 
A. Multiple myeloma, B. Metastasis, C. Osteosarcoma, D. Chondrosarcoma
B: Metastasis
Answer: B: Metastasis 
Explanation: Ans. is 'b' i.e., MetastasisImportant factso Commonest bone malignancies-Secondarieso Commonest primary malignant tumor-Multiple myelomao Commonest primary malignant tumor of long bones-Osteosarcomao Commonest benign tumor of bone(Osteochondroma is not true neoplasm since its growth stops with cessation of growth at the epiphyseal plate)-Osteochondromao Commonest true benign tumor of bone-Osteoid osteomao Commonest benign tumor of hand-Enchondroma