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
[{'content': 'In osteogenic sarcoma predominant histological finding is - \nSelect and explain. \nA. Giant cells, B. Osteoid forming tumor cells, C. Fibroblastic proliferation, D. Chondroblasts', 'role': 'user'}, {'content': "Answer: B \nExplanation: 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.", 'role': 'assistant'}]