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
Osteoblastic secondaries are most commonly seen from which primary malignancy? 
Select and explain. 
A. Lung, B. Prostate, C. Adrenal, D. Breast
B: Prostate
Answer: B: Prostate 
Explanation: Ans is 'b' i.e. Prostate