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A two-year study beginning in 1977 found that, among 85-year-old people, those whose immune systems were weakest were twice as likely to die within two years as others in the study. The cause of their deaths, however, was more often heart disease, against which the immune system does not protect, than cancer or infections, which are attacked by the immune system.
Which of the following, if true, would offer the best prospects for explaining deaths in which weakness of the immune system, though present, played no causal role?
| Text from Passage | Analysis |
| A two-year study beginning in 1977 found that, among 85-year-old people, those whose immune systems were weakest were twice as likely to die within two years as others in the study. |
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| The cause of their deaths, however, was more often heart disease, against which the immune system does not protect, than cancer or infections, which are attacked by the immune system. |
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The passage presents a study finding and then immediately introduces a puzzling contradiction. We start with a clear correlation between weak immunity and higher death rates, but then learn that these deaths were mostly from heart disease - something the immune system doesn't even protect against.
There's no explicit conclusion in this passage - it simply presents a medical puzzle where weak immune systems correlate with higher death rates, but the deaths aren't from causes that immunity would prevent.
This isn't a traditional argument with premises supporting a conclusion. Instead, it's a descriptive passage that sets up a paradox: if people with weak immune systems are dying more often, but not from things their immune system would protect against anyway, then what's really causing the higher death rate? The passage leaves this question unanswered, which is why we need to find an explanation in the answer choices.
Paradox - We need to explain how weak immune systems can be associated with higher death rates even when the deaths aren't from diseases that the immune system actually fights against
The claims are quantitative (twice as likely to die) and qualitative (heart disease was MORE OFTEN the cause than cancer/infections). We must respect that weak immunity group had 2x death rate but mostly died from heart disease, not immune-related diseases
We need to find scenarios that explain why people with weak immune systems would die more often from heart disease specifically, even though immune systems don't protect against heart disease. We're looking for a common underlying factor that both weakens immunity AND increases heart disease risk simultaneously