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: Surgery
MC malignant bone tumour is: September 2003 
Select and explain. 
A. Osteosarcoma, B. Osteoclastoma, C. Secondaries, D. Multiple myeloma
C: Secondaries
Answer: C: Secondaries 
Explanation: Ans. C i.e. Secondaries