This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Anatomy
Which of the following is bone forming malignant tumor 
Select and explain. 
A. Osteoid osteoma, B. Osteosarcoma, C. Chondroblastoma, D. Giant cell tumor
B: Osteosarcoma
Answer: B: Osteosarcoma 
Explanation: Bone forming malignant tumor is Osteosarcoma Refer Adams Outline of ohopedics 14th, /e p 113