单选题：国家一级保护野生药材物种是指（　　）

题目内容：
国家一级保护野生药材物种是指（　　） A．濒临灭绝状态的稀有植物物种
B．濒临灭绝状态的稀有珍贵野生药材物种
C．分布区域缩小，资源处于衰竭状态的重要野生药材物种
D．资源严重减少的主要常用野生药材物种
E．分布区域缩小的主要动植物物种
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