Reading ComprehensionPassage:Vaccinations work by stimulating the immune system to recognize and fight specific pathogens.

The passage explains that vaccines stimulate the immune system so it can recognize pathogens and respond more quickly in the future. This means vaccines act as a training mechanism for the immune system. Option C correctly reflects this explanation. Option A is incorrect because vaccines do not eliminate all bacteria permanently. Option B is the opposite of what the passage states, as vaccines strengthen immune response. Option D is incorrect because vaccines are preventive, not treatments administered after symptoms appear. NEX reading comprehension questions often test understanding of scientific processes explained in simple language, and correct answers usually restate information using different wording rather than introducing new ideas.

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