How can quantum dots be used to confirm diseases?

A．By traditionally looking at a person's blood under a microscope.

B．By letting a person take some kind of medicine.

C．By lighting up in the presence of a targeted molecule.

D．By subjecting a person to an X-ray examination.

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细节题。题干：quantum dots是怎么被用来辨认疾病的?题干中的信息词为quantum dots，conftrm diseases，用信息词定位到第三段最后两句：Quantum dots are particles that give off light when activated．Researchers are studying ways to program them to identify diseases by lighting up in the presence of a targeted molecule．quantum dots直接出现在原文中，identify diseases与题干中confirm diseases为同义改写，表示“辨认疾病”。原文说，如果存在靶分子(quantum dots)的话，量子点就会发光，以此辨认疾病。选项C的内容来自原文中的“by lighting up in the presence of a targeted molecule”，本题答案为C选项。

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