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: Surgery
Soap bubble appearance on Xray is seen in which bone tumor ? 
Select and explain. 
A. Osteogenic sarcoma, B. Giant cell tumor, C. Multiple myeloma, D. Chondroblastoma
A: Osteogenic sarcoma
Answer: A: Osteogenic sarcoma 
Explanation: Ans. is 'A' i.e., Rheumatoid ahritis Repeat from previous sessions. See explanation-3 of session-3.