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: Anatomy
[{'content': 'A 50 year old man suffering from carcinoma of prostate showed areas of sclerosis and collapse of T10 and T11 vertebrae in X-ray. The spread of this cancer to the above vertebrae was most probably through - \nSelect and explain. \nA. Sacral canal, B. Lymphatic vessels, C. Internal vertebral plexus of veins, D. Superior rectal veins', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Vertebral metastasis in prostate cancer is explained by the prostatic veins which drain into internal vertebral venous plexus (Batson’s vertebral plexus).', 'role': 'assistant'}]