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
What is the most probable diagnosis for on the x-ray of a 20 year old female who came with knee swelling 
Select and explain. 
A. Osteosarcoma, B. Osteoclastoma, C. Osteochondroma, D. None of the above
A: Osteosarcoma
Answer: A: Osteosarcoma 
Explanation: 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.