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【单选题】
下列哪项是正确的A.
紫外线的波长范围是500～200nm
B.
紫外线主要的生物作用是光热效应
C.
长波紫外线主要能引起蛋白质和核酸结构上的变化，具有很强的杀菌作用
D.
中波紫外线能促进上皮生长，加速再生，引起色素沉着和抗佝偻病等作用
E.
短波紫外线的生物学作用，可与光敏剂配合治疗银屑病和白癜风
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