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: Pathology
The most common bone cancer is: 
Select and explain. 
A. Osteosarcoma, B. Metastatic bone cancer, C. Multiple myelonia, D. Squamous cell carcinoma
B: Metastatic bone cancer
Answer: B: Metastatic bone cancer 
Explanation: None