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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,哪个剂量组为最大无作用剂量A.
高剂量组出现了明显的中毒症状，与对照组相比P<0.01< /div>
B.
中剂量组出现了轻微中毒的症状,与对照相比P<0.05< /div>
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.
最低剂量无任何中毒症状,与对照组相比P>0.05
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