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': 'After doing a graft repair of a thoraco-abdominal aneurysm, the patient was not able to move both of his lower limbs. Most probable cause is \nSelect and explain. \nA. Damage to thoracic splanchnic nerve, B. Damage to lumbar spinal nerves, C. Ischemia of lower limbs, D. Insufficiency of aeria magna radicularis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. d. Insufficiency of aeria magna radicularis', 'role': 'assistant'}]