This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Brain , Subject name: Anatomy
[{'content': 'Lowest projection of ligamentum denticulatum lies at which level of spinal nerves \nSelect and explain. \nA. T9,10, B. T12,L1, C. S2,3, D. S4,5', 'role': 'user'}, {'content': "Answer: B \nExplanation: First tooth of ligamentum denticulatum is at the level of foramen magnum, last between T12-L1 Ref: Gray's39e/p227", 'role': 'assistant'}]