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: Orthopaedics
[{'content': 'What is the most probable diagnosis for on the x-ray of a 20 year old female who came with knee swelling \nSelect and explain. \nA. Osteosarcoma, B. Osteoclastoma, C. Osteochondroma, D. None of the above', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Sunburst appearance of Osteosarcoma Sunburst appearance is a type of periosteal reaction giving the appearance of a sunburst secondary to an aggressive The sunburst appearance occurs when the lesion grows too fast and the periosteum does not have enough time to lay down a new layer and instead the It is frequently associated with or osteoblastic metastases Ref: Maheshwari 6e pg 239.', 'role': 'assistant'}]