This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
[{'content': '7 years old child presents with a lesion in upper tibia. X ray shows radioluscent area with Codmans triangle and Sunray appearance. Diagnosis is \nSelect and explain. \nA. Ewing sarcoma, B. Osteosarcoma, C. Osteoid Osteoma, D. Chondrosarcoma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Sunray (sunburst) appearance and Codmans triangle ***typical freatures of Osteosarcoma ***may also be seen in Ewings sarcoma, osteomyelitis onion peel apperacne ***typical feature of Ewings sarcoma ***May also be seen in Osteosarcoma, and osteomyelitis Refer Maheshwari 9th/e p 240.', 'role': 'assistant'}]