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Re: People with a certain eye disorder are virtually unable to see in mode [#permalink]
IMO the official answer E is wrong for this argument & E is more like a strengthener.
I think D is an inference that can be drawn based on the information given in the argument.

AjiteshArun GMATNinja GMATGuruNY VeritasPrepBrian @MartyMurray DmitryFarber @IanStewart@AndrewN
Experts please shade some light on this.

Thanks
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People with a certain eye disorder are virtually unable to see in mode [#permalink]
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GMATmona07 wrote:
IMO the official answer E is wrong for this argument & E is more like a strengthener.
I think D is an inference that can be drawn based on the information given in the argument.

AjiteshArun GMATNinja GMATGuruNY VeritasPrepBrian @MartyMurray DmitryFarber @IanStewart@AndrewN
Experts please shade some light on this.

Thanks

Hi GMATmona07,

Have a look at this part of the argument:
Rishi108 wrote:
Their retinal cells are also not excessively sensitive to red components of moderately bright light.

If their cells aren't excessively sensitive to red, it's possible that their cells are normal as far as red is concerned (it's also possible that their cells are less sensitive, but we wouldn't normally use the phrase are also not excessively sensitive if what we really wanted to say was less sensitive).

If their cells are normal as far as red is concerned, we don't have a very good reason to believe that the biological mechanism by which they perceive the color red is different from the mechanism of other people. Keep in mind that option D is not about "the biological mechanism" in general. It's limited to "the biological mechanism by which they perceive the color red". For all we know, their cells are normal as far as red is concerned.
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People with a certain eye disorder are virtually unable to see in mode [#permalink]
Rishi108 wrote:
People with a certain eye disorder are virtually unable to see in moderately bright light, which seems to them unbearably intense, since the cells of their retinas are overwhelmed by moderately bright light. These people do, however, show normal sensitivity to most components of dim light. Their retinal cells are also not excessively sensitive to red components of moderately bright light.

The information above best supports which of the following hypotheses about people who have the disorder described and who have no other serious visual problems?


INFERNCE based question, start with eliminating choices.

Quote:
A. They typically see more acutely at night and in dim light than do people who do not have the disorder.

We cannot hypothesize for people who do not have this disorder because argument is only concerned with people having the concerned disorder. EIMINATE

Quote:
B. They react to extremely bright light in much the same way that people without the disorder do.

Again we know nothing about people who do not have this disorder.
EIMINATE

Quote:
C. In an otherwise darkened concert hall, they will see a dimly illuminated red exit sign more clearly than people without the disorder will.

Same as A & B.
EIMINATE

Quote:
D. The biological mechanism by which they perceive the color red is different from the mechanism of people who do not have the disorder.

Same as A, B & C (We know nothing about the mechanism of people who do not have this disorder)
EIMINATE

Quote:
E. Eyeglasses that are transparent to red components of light but filter out other components of light will help them see in moderately bright light.

This choice focuses only on People having this disorder (It is exactly what we want) and how blocking other components of light could help them see in mod. bright light.
Correct Answer
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People with a certain eye disorder are virtually unable to see in mode [#permalink]
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