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答案：
A
研究发现
过敏由花粉引起，花粉由蜜蜂带来，因此能够得出蜜蜂才是导致过敏的原因
A 没有蜜蜂，花粉不会导致过敏。正确，因为花粉并不是导致过敏的真正原因
B 蜂蜜在花产生的过程中起着重要作用。花的产生，无关选项
C 过敏案例在蜜蜂在的时候才被研究。明显实验方法的错误，既然蜜蜂是关键原因，那必定有蜜蜂在或者不在的对比实验
D 没有过敏的时候，没有蜜蜂花也会生长。未知
E 即使没有花粉，过敏也可能由花直接导致。未知
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