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【单选题】
下列叙述中哪项与维生素A不符A.
维生素A侧链上具有四个双键，故现共有16个顺反异构体
B.
式维生素A的活性最强
C.
本品对紫外线不稳定，容易在空气中氧化生成环氧化物
D.
维生素A是构成视觉细胞感光物质的前体
E.
维生素A在体内被代谢为维生素A酸而排泄
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