This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Musculoskeletal system, Subject name: Anatomy
Most common malignant bone tumors 
Select and explain. 
A. Osteogenic sarcoma, B. Secondaries, C. Osteoma, D. Enchondroma
B: Secondaries
Answer: B: Secondaries 
Explanation: Metastatic tumors are the most common form of skeletal malignancy. Refer Robbins page no 8/e 1236p