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
Expansile lytic osseous metastases are characteristic of 
primary malignancy of: 
Select and explain. 
A. Kidney, B. Bronchus, C. Breast, D. Prostate
A: Kidney
Answer: A: Kidney 
Explanation: None