This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: All India exam, Subject name: Pathology
[{'content': 'A 25-year-old male presents with swelling over right knee since 1 month. The radiograph is shown here. Which of the following statement is true regarding this condition? \nSelect and explain. \nA. It is a bone forming primary malignant tumour of bone, B. Codmans triangle can be seen, C. Hematogenous spread with lung metastasis are common., D. All of above', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Osteosarcoma This primary malignant bone-forming neoplasm is rare, but is still the commonest primary malignant lesion of bone after myeloma.', 'role': 'assistant'}]