波长、单次照射剂量与色素沉着的关系叙述正确的是（）。
A.254nm的短波>297nm的中波>340nm的长波
B.297nm的中波>340nm的长波>254nm的短波
C.340nm的长波>254nm的短波>297nm的中波
D.340nm的紫外线，小于阈红斑量即可引起色素沉着
E.254nm、297nm的紫外线，小于阈红斑量即可引起色素沉着
参考答案：D
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