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
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 - 
Select and explain. 
A. Sacral canal, B. Lymphatic vessels, C. Internal vertebral plexus of veins, D. Superior rectal veins
C: Internal vertebral plexus of veins
Answer: C: Internal vertebral plexus of veins 
Explanation: Vertebral metastasis in prostate cancer is explained by the prostatic veins which drain into internal vertebral venous plexus (Batson’s vertebral plexus).