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: Pathology
[{'content': 'Osteoblastic metastasis is seen in - \nSelect and explain. \nA. Lung Ca, B. Prostate Ca, C. Breast Ca, D. Hepatocellular Ca', 'role': 'user'}, {'content': 'Answer: B \nExplanation: . Prostate Ca', 'role': 'assistant'}]