I came across a CR question whose answer explanations, I couldnt understand.
Q-1) A researcher discovered 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
The researcher’s conclusion depends on which of the following assumptions?
A. High immune-system activity protects against mental illness better than normal immune-system activity
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.
E. Psychological treatment of mental illness is not as effective as is medical treatment.
My query: the researcher is saying that low level of immune system activity means lower on tests of mental health. So why is it not true that if there is mental illness there is a chance that immune system is low. thats why he is scoring low on mental health.