This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Osteogenic Sarcoma, Subject name: Orthopaedics
In osteogenic sarcoma predominant histological finding is - 
Select and explain. 
A. Giant cells, B. Osteoid forming tumor cells, C. Fibroblastic proliferation, D. Chondroblasts
B: Osteoid forming tumor cells
Answer: B: Osteoid forming tumor cells 
Explanation: Ans. is 'b' i.e.. Osteoid forming tumor ceils [Ref: Apley's 9th/e p. 208}Histologic appearance of osteosarcomao It appears pale and extending through the cortex on gross cut section examination,o On histological sections it consists of malignant stromal tissue showing osteoid formation.o Osteoid bone formation by tumor cells is diagnostic of OGS.