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Postby Lionroar » Wed Oct 11, 2017 4:49 pm

In the Next Step Full-Length 7 CARS section, question 26 asked about why the author mentioned the prevalence of XDR-TB. I chose choice A because the first paragraph focused on how TB was becoming “increasingly prevalent”, while increasing difficulty in treating TB was never mentioned. I don’t see how choice D, the correct answer, is the reason XDR-TB was brought up. Thank you very much.
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Re: NS FL #7 CARS Q26

Postby NS_Tutor_Andrew » Wed Oct 11, 2017 6:46 pm

Hi Lionroar,

Thanks for the question! The quickest way to see why A is wrong is to note that the second sentence states that "TB caused by drug-resistant bacilli is becoming extremely prevalent" -- in other words, we don't know that TB in general is becoming increasingly prevalent, just that drug-resistant forms are. It could well be the case that the overall incidence of TB is holding constant, but that drug-resistant forms are accounting for a larger share of incident TB cases. In terms of why D is right, we can infer that XDR-TB is difficult to treat both from its name and from statements the author makes about how the emergence of XDR makes adherence to treatment increasingly important. If XDR-TB is more difficult to treat, and if drug-resistant TB accounts for more and more cases of TB, then we can infer that TB is becoming harder to treat in general. Although D does involve a certain amount of inference beyond what the author states directly, it is also clearly a better answer than B or C, and once we identify the issue with A, D becomes the best—or at least, the least bad—answer choice.

Hope this helps & keep up the careful analysis!
Andrew D.
Content Manager, Next Step Test Prep.

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