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: Radiology
Soap bubble appearance is shown by: 
Select and explain. 
A. Osteoclastoma, B. Osteosarcoma, C. Multiple myeloma, D. Ewing's sarcoma
A: Osteoclastoma
Answer: A: Osteoclastoma 
Explanation: None