单选题：根据以下材料，回答题A．山豆根B．远志C．北豆根D．天冬E．白及外皮易剥落，质韧，不易折断，断面纤维性强，有髓，味苦的药

题目内容：
根据以下材料，回答题
A．山豆根
B．远志
C．北豆根
D．天冬
E．白及
外皮易剥落，质韧，不易折断，断面纤维性强，有髓，味苦的药材是
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