WeakenDiff: Easy
Logic Breakdown
Passage Summary: Since grapefruit juice makes medicine stronger, the author suggests we should intentionally drink the juice and take less medicine to achieve the desired effect safely.
Conclusion: The best medical strategy is to take lower doses of certain medicines combined with grapefruit juice.
Reasoning: Grapefruit juice increases the absorption of these medicines, allowing a lower dose to have the same effect as a standard dose.
Analysis: The author assumes that the 'boost' provided by the juice is consistent and controllable, but biology is rarely that tidy. To weaken this, look for an answer that suggests the interaction is unpredictable or that the chemical levels in grapefruit juice vary too much to be used for precise dosing. If the resulting dose is inconsistent, the author's 'best approach' becomes a dangerous gamble for the patient.
Conclusion: The best medical strategy is to take lower doses of certain medicines combined with grapefruit juice.
Reasoning: Grapefruit juice increases the absorption of these medicines, allowing a lower dose to have the same effect as a standard dose.
Analysis: The author assumes that the 'boost' provided by the juice is consistent and controllable, but biology is rarely that tidy. To weaken this, look for an answer that suggests the interaction is unpredictable or that the chemical levels in grapefruit juice vary too much to be used for precise dosing. If the resulting dose is inconsistent, the author's 'best approach' becomes a dangerous gamble for the patient.
Passage Stimulus
Passage Redacted
Unlock Full Passage6.Which one of the following, if true, most seriously weakens the argument?
Correct Answer
A
If the chemical’s amount varies unpredictably from glass to glass, then the effect on absorption—and thus the effective dose—would be unpredictable. That makes the proposed approach unsafe and undermines the claim that prescribed amounts of juice can reliably yield the “lowest effective dose.”
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