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
Radiosensitive bone tumor 
Select and explain. 
A. Fibrosarcoma, B. Malignant GIT, C. Multiple myeloma, D. Synovial cell sarcoma
C: Multiple myeloma
Answer: C: Multiple myeloma 
Explanation: None