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题目材料：
Pharmaceutical Developer: Until recently certain bacteria were considered too dangerous for use in vaccines. However, without a particular gene, these bacteria are harmless, and we can now remove the gene from these bacteria. Therefore, vaccines containing these bacteria can now be used safely.
Scientist: Actually, the safety of such vaccines remains doubtful. Genes often migrate from one strain of bacteria to another, and other strains of bacteria in the human body contain the harmful gene.
The scientist's response does which of the following?
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A. Indicates a possibility that shows that the conclusion drawn by the pharmaceutical developer does not follow from the evidence cited in its support
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B.Argues that all of the evidence that the pharmaceutical developer cites actually undermines the pharmaceutical developer's own conclusion
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C.Challenges the truth of a piece of evidence cited in support of the pharmaceutical developer's conclusion
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D.Offers a hypothesis that, if true, would provide an alternative explanation of the facts cited by the pharmaceutical developer
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E.Points out a further consequence of the pharmaceutical developer's conclusion that follows directly from that conclusion
A显示答案
