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': 'Secondary deposits from prostatic carcinoma is commonest in - \nSelect and explain. \nA. Bone, B. Kidney, C. Liver, D. Brain', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Bone", 'role': 'assistant'}]