medium · LSAT Logical Reasoning
In a trial, patients who received an experimental drug recovered from the illness faster, on average, than patients who did not receive it. The researchers concluded that the drug accelerates recovery.
Which one of the following, if true, most strengthens the researchers' conclusion?
- Patients receiving higher drug doses recovered faster than otherwise comparable patients receiving lower doses.
- A few patients receiving no drug also recovered unusually quickly.
- Patients assigned different nominal doses showed identical concentrations of the active drug in their blood.
- The drug is considerably more expensive to produce than the standard treatment.
- The drug had previously been approved to treat an unrelated condition.
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