This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Medicine
[{'content': 'In anterior spinal artery syndrome which of the following is spared \nSelect and explain. \nA. Posterior columns, B. Lateral spinothalamic tract, C. Anterior spinothalamic tract, D. Corticospinal tract', 'role': 'user'}, {'content': 'Answer: A \nExplanation: (A) Posterior columns # ANTERIOR SPINAL ARTERY SYNDROME> Infarction of the cord is generally the result of occlusion or diminished flow in this artery.> The result is extensive bilateral tissue destruction that spares the posterior columns.> All spinal cord functions--motor, sensory, and autonomic--are lost below the level of the lesion, with the striking exception of retained vibration and position sensation.', 'role': 'assistant'}]