This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Skeletal infections, Subject name: Anatomy
[{'content': 'X ray appearance of Osteosarcoma are all except \nSelect and explain. \nA. Perosteal reaction, B. Codmnans triangle, C. Soap bubble, D. Sun ray appearance', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Radilogical features of OGS are Irregular bone destruction with new bone formation Periosteal reaction :Codmans Triangle Refer Maheshwari 6th/e p 239', 'role': 'assistant'}]