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06 Jul 2026, 11:56
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Studies have shown that treating certain illnesses with treatment X produces the same beneficial changes in patients’ conditions as treating the same illnesses with treatment Y. Furthermore, treatment X is quicker and less expensive than treatment Y. Thus, in treating these illnesses, treatment X should be preferred to treatment Y.
Which one of the following, if true, would most weaken the argument above?
(A) Unlike treatment Y, treatment X has produced harmful side effects in laboratory animals.
(B) There are other illnesses for which treatment Y is more effective than treatment X.
(C) Until recently, treatment X was more expensive than treatment Y.
(D) Treatment Y is prescribed more often by physicians than treatment X.
(E) A third treatment, treatment Z, is even quicker and less expensive than treatment X.
Which one of the following, if true, would most weaken the argument above?
(A) Unlike treatment Y, treatment X has produced harmful side effects in laboratory animals.
(B) There are other illnesses for which treatment Y is more effective than treatment X.
(C) Until recently, treatment X was more expensive than treatment Y.
(D) Treatment Y is prescribed more often by physicians than treatment X.
(E) A third treatment, treatment Z, is even quicker and less expensive than treatment X.
06 Jul 2026, 19:45
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Studies have shown that treating certain illnesses with treatment X produces the same beneficial changes in patients’ conditions as treating the same illnesses with treatment Y. Furthermore, treatment X is quicker and less expensive than treatment Y. Thus, in treating these illnesses, treatment X should be preferred to treatment Y.
Which one of the following, if true, would most weaken the argument above?
The argument says treatment X gives the same benefits as treatment Y, but is quicker and cheaper. So it concludes that X should be preferred. The key weakness would be evidence that X has an important disadvantage that Y does not have.
(A) Unlike treatment Y, treatment X has produced harmful side effects in laboratory animals.
This is correct. If X may have harmful side effects and Y does not, then X may not be preferable even though it is quicker and cheaper.
(B) There are other illnesses for which treatment Y is more effective than treatment X.
This is irrelevant. The argument is only about “these illnesses,” not other illnesses.
(C) Until recently, treatment X was more expensive than treatment Y.
This does not weaken the argument. The argument is about which treatment should be preferred now.
(D) Treatment Y is prescribed more often by physicians than treatment X.
This does not weaken the argument much. What doctors currently prescribe more often does not show that Y is actually better.
(E) A third treatment, treatment Z, is even quicker and less expensive than treatment X.
This does not weaken the comparison between X and Y. Z may be even better, but X could still be preferred to Y.
Answer: (A)
Which one of the following, if true, would most weaken the argument above?
The argument says treatment X gives the same benefits as treatment Y, but is quicker and cheaper. So it concludes that X should be preferred. The key weakness would be evidence that X has an important disadvantage that Y does not have.
(A) Unlike treatment Y, treatment X has produced harmful side effects in laboratory animals.
This is correct. If X may have harmful side effects and Y does not, then X may not be preferable even though it is quicker and cheaper.
(B) There are other illnesses for which treatment Y is more effective than treatment X.
This is irrelevant. The argument is only about “these illnesses,” not other illnesses.
(C) Until recently, treatment X was more expensive than treatment Y.
This does not weaken the argument. The argument is about which treatment should be preferred now.
(D) Treatment Y is prescribed more often by physicians than treatment X.
This does not weaken the argument much. What doctors currently prescribe more often does not show that Y is actually better.
(E) A third treatment, treatment Z, is even quicker and less expensive than treatment X.
This does not weaken the comparison between X and Y. Z may be even better, but X could still be preferred to Y.
Answer: (A)
alamin8
Joined: 24 May 2025
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29 Jul 2026, 11:37
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Great explanation. Indeed, the first one is the answer because only if X has side effects, it cannot be preferred.
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