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
[{'content': "Most common cause of osteoblastic bone metastais \nSelect and explain. \nA. Renal cell carcinoma, B. Prostaic carcinoma, C. Wilm's tumor, D. Neuroblastoma", 'role': 'user'}, {'content': 'Answer: B \nExplanation: Prostate carcinoma-M/c osteoblastic.', 'role': 'assistant'}]