Bone forming tumors are -a) Osteosarcomab) Osteoid osteomac) Giant cell tumourd) Osteoblastomae) Chondrosarcoma: (A) abd, (B) bcd, (C) abc, (D) ab
Answer is A. Bone forming tumors 

Benign : - Osteoma, Osteoid osteoma, Osteoblastoma.
Malignant : - Osteosarcoma