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 most common metastasis to \nSelect and explain. \nA. Skull, B. Femur, C. Lumbar spine, D. Sacrum', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Answer- C. Lumbar spineMost common metastatic sites of prostate carcinoma are lymph nodes & bones.Lymphatic metastasis occurs most commonly to - obturator lymph nodes.Most common site of bony metastasis is lumbar spine.', 'role': 'assistant'}]