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
X ray appearance of Osteosarcoma are all except 
Select and explain. 
A. Perosteal reaction, B. Codmnans triangle, C. Soap bubble, D. Sun ray appearance
C: Soap bubble
Answer: C: Soap bubble 
Explanation: Radilogical features of OGS are Irregular bone destruction with new bone formation Periosteal reaction :Codmans Triangle Refer Maheshwari 6th/e p 239