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Answer: B

This argument asks you to support the editor’s position, which hinges around her statement, thus far. Her point is that there may be patients who have taken the new drug and who have not yet shown side effects, but may in the future. She assumes that there are such patients, and the fact that patients have not shown side effects yet does not mean there aren’t any. A good answer choice here will clearly establish that difference.

(B) Yes. The key in the editor’s statement is thus far, which implies that side effects could still show up in the future, and this answer choice addresses that possibility.
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After eliminating the ones (A,C,D,E) which are out of scope or don't make sense, apply the extreme test on the remaining ones to get the answer
In the extreme test, one should strengthen and other should weaken the claim.
Bunuel
A researcher concluded her report on a study testing a new antihypertension drug by saying, “Patients who used the new drug have experienced no significant side effects.” The editor of the medical journal to which she submitted the report suggested that she change the conclusion to “Patients who used the new drug appear thus far to have experienced no significant side effects.”

Which of the following, if true, provides the best logical justification for the editor’s suggestion that the researcher’s conclusion be altered?

A. Some patients who took the new antihypertension drug experienced a mild increase in nausea, a side effect easily averted by taking the medication with food.
Here some patients could mean 1 to almost all. Plus here there is a 100% chance of a side effect, something the researcher claims to not happen. Eliminate

B. The new antihypertension drug could have caused side effects, the visible signs of which have not yet appeared in the patients who participated in the study.
Apply the extreme test here
the new drug has side effects, visible signs may not appear for a lifetime. => strengthens argument
the new drug has side effects, visible signs should appear immediately => weakens the argument


C. The researcher’s report does not sufficiently compare the effects of the antihypertension drug with those of other, established antihypertension drugs.
this focuses on comparing the drug to others, which is unrelated to the issue of undiscovered side effects. Eliminate

D. The majority of Americans have blood pressure far enough outside the normal range to be considered at least mildly hypertensive.
this discusses the prevalence of hypertension but does not relate to the reasoning behind modifying the conclusion. Eliminate

E. The severity of side effects from antihypertension drugs varies from patient to patient.
this states a general fact about variability in side effects, but it does not explain why the study’s conclusion should be more cautious. Eliminate


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