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
[{'content': 'Osteoblastic secondaries are most commonly seen from which primary malignancy? \nSelect and explain. \nA. Lung, B. Prostate, C. Adrenal, D. Breast', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans is 'b' i.e. Prostate", 'role': 'assistant'}]