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': 'Mets form prostatic carcinoma are common in \nSelect and explain. \nA. Liver, B. Kidney, C. Bone, D. Brain', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Through batson plexus cancer spreads through bone.', 'role': 'assistant'}]