CR - Immune-system : GMAT Critical Reasoning (CR)
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# CR - Immune-system

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VP
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30 Jun 2008, 09:23
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This is one good question

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
physical disease.
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
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.
E. Psychological treatment of mental illness is not as effective as is medical treatment.
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Director
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30 Jun 2008, 09:28
IMO D.
It is killing the alternate causation. By assuming "Mental illness does not cause people’s immune-system activity to decrease" we reinforce that indeed it is "immune system causing mental illness" and not the other way round.
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30 Jun 2008, 09:39
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 physical disease.

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 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.
E. Psychological treatment of mental illness is not as effective as is medical treatment.

This is a cause effect question. We need to ensure that by swaping the cause and effect does not affect the condition.

Low immune system --> Mental illness.

The clear assumption on the author's behalf is that the vice versa is not true to start of with. ie Mental illness --> Low immune system.

The option D spells out this assumption.
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30 Jun 2008, 10:12
D for me, the rest of the arguments seem out of scope
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30 Jun 2008, 11:54
Could someone please explain what is wrong with C
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30 Jun 2008, 14:00
vksunder wrote:
Could someone please explain what is wrong with C

C is way too extreme. No where in the passage can one infer that having a good immune system will altogether prevent mental illness. Always try keeping away from extreme answer choices, they are almost never correct on the gmat.
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30 Jun 2008, 14:23
Thanks!
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30 Jun 2008, 15:39
i will go for D..

actually C is the conclusion of the researcher...we are looking for assumption
VP
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30 Jun 2008, 22:43
OA is D guys ....
Even I was confused between (C) and (D).
Grt explaination for (D) its actually cause effect funda.......
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30 Jun 2008, 23:02
spriya wrote:
This is one good question

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 physical disease.
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 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.
E. Psychological treatment of mental illness is not as effective as is medical treatment.

IMO D
my line of reasoning is as follows

Premise :- 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
Conclusion:- The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.

Definately the assumption has to be that mental illenss does not affect ppl s immune system
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01 Jul 2008, 02:19
spriya wrote:
This is one good question

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
physical disease.
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
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.
E. Psychological treatment of mental illness is not as effective as is medical treatment.
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04 Aug 2008, 20:57
vdhawan1 wrote:
spriya wrote:
This is one good question

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 physical disease.
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 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.
E. Psychological treatment of mental illness is not as effective as is medical treatment.

IMO D
my line of reasoning is as follows

Premise :- 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
Conclusion:- The researcher concluded from this experiment that the immune system protects against mental illness as well as against physical disease.

Definately the assumption has to be that mental illenss does not affect ppl s immune system

I didnt get it guys. If the assumption is that mental illness does not cause immune system activity to decrease then people with mental illness have normal / high immune system. But the author says ppl with low level immune system tend to score low on mental tests. So how can ppl have normal immune system and still have mental illness.
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05 Aug 2008, 00:09
What is wrong with B,

Author discuss about mental illness and concluded for both mental illness and physical health
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05 Aug 2008, 14:33
IMO B
Re: CR - Immune-system   [#permalink] 05 Aug 2008, 14:33
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