A researcher discovered that that people who have low levels of immune-system activity tend to score much lower on tests of mental health than do people with normal or high immune-system activity. The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease. On which of the following assumptions does the researchers conclusion depend?

A High immune system activity protects against mental illness better than normal immune-system activity does

B Mental illness is similar to physical disease in its effects on body systems

C People with high immune-system activity cannot develop mental illness

D Mental illness does not cause people's immune-system activity to decrease

Solution

Correct Answer: Option D

Solution

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