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【单选题】
慢性毒性试验设有四个剂量组（高、中、低、最低）及对照组，哪个剂量组为最小有作用剂量（）A.
高剂量组出现了明显的中毒症状，与对照组相比P＜0.01
B.
中剂量组出现了轻微中毒症状，与对照组相比P＜0.05
C.
低剂量组出现了个别动物极轻微中毒症状，与对照组相比P>0.05
D.
最低剂量组无任何中毒症状，与对照组相比P>0.05
E.
对照组无任何中毒症状
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