medium · LSAT Logical Reasoning
A recent observational study found that people who drink green tea daily have a lower risk of heart disease. The study's authors concluded that green tea consumption prevents heart disease.
Which one of the following, if true, most seriously weakens the authors' conclusion?
- Daily green-tea drinkers are also far more likely to engage in regular cardiovascular exercise.
- Green tea contains potent antioxidants shown in trials to improve the functioning of blood vessels.
- Green tea generally costs considerably more per individual serving than many other common herbal teas.
- The observational study tracked a very large group of participants closely over a full decade.
- Green tea consumption also correlates with a modestly lower measured risk of several specific cancers.
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