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
Ca prostate most common metastasis to 
Select and explain. 
A. Skull, B. Femur, C. Lumbar spine, D. Sacrum
C: Lumbar spine
Answer: C: Lumbar spine 
Explanation: 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.