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': 'CA prostate metastasizes to the vertebrae by \nSelect and explain. \nA. Direct spread, B. Lymphatic spread, C. Batson’s plexus, D. All of the above', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Through Batson’s periprostatic plexus prostate Ca spreads to verterbra.', 'role': 'assistant'}]