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Which of the following most logically completes the passage?

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Senior Manager
Senior Manager
Joined: 31 Oct 2011
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Kudos [?]: 52 [0], given: 18

GMAT Tests User
Which of the following most logically completes the passage? [#permalink] New post 11 May 2012, 12:35
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

51% (03:11) correct 48% (02:38) wrong based on 84 sessions
Which of the following most logically completes the passage?

Appendicitis (inflammation of the appendix) is potentially fatal; consequently, patients with
symptoms strongly suggesting appendicitis almost have their appendix removed. The
appropriate surgery is low-risk but performed unnecessarily in about 20 percent of all cases. A
newly developed internal scan for appendicitis is highly accurate, producing two
misdiagnoses for every 98 correct diagnoses. Clearly, using this test, doctors can largely avoid
unnecessary removals of the appendix without, however, performing any fewer necessary
ones than before, since .

A. the patients who are correctly diagnosed with this test as not having appendicitis
invariably have medical conditions that are much less serious than appendicitis

B. the misdiagnoses produced by this test are always instances of attributing appendicitis
to someone who does not, in fact, have it

C. all of the patients who are diagnosed with this test as having appendicitis do, in fact,
have appendicitis

D. every patient who is diagnosed with this test as having appendicitis has more than one
of the symptoms generally associated with appendicitis

E. the only patients who are misdiagnosed using this test are patients who lack one or
more of the symptoms that are generally associated with appendicitis
[Reveal] Spoiler: OA
Senior Manager
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Re: GWD #21 V4 [#permalink] New post 11 May 2012, 13:00
It is a really tough question.

I initially picked C but after reading other people's opinions, realized that the correct answer must be B.
My understanding is like this. Feel free to point out any flaws.

Before a newly developed internal scan, the surgery was performed unneccessarily in about 20 percent.
(We can say from this statement that of the patients who underwent this surgery, 20 percents didn't actually have Appendictis. I can assume that those unneccessary surgery were caused by misdiagnoses.)

The newly developed internal scan lowered the chance of misdiagnoses.

This newly developed internal scan enables doctors to avoid unnecessary surgery but doesn't lower the number od incidents that patients who need the surgery don't get the surgery.

As people say, misdisgnoses have two cases. 1. actually have one but diagnoed as not having
2. actually don't have one but diagnosed as having.

In the case 1, patients need the surgery but don't get it.
In the case 2, patients don't need the surgery but get it.

If misdiagnoses with the newly developed internal scan is only case 2, unneccessary surgery can be reduced because the number of misdiagonoses is decreased while neccessary sugery is not decreased.
Intern
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Joined: 19 Feb 2012
Posts: 25
Location: India
Concentration: Technology, General Management
Schools: WBS '15
GMAT 1: 700 Q48 V38
GPA: 3.36
WE: Analyst (Computer Software)
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Re: GWD #21 V4 [#permalink] New post 16 May 2012, 00:44
it should be B, but pls provide the complete question
Re: GWD #21 V4   [#permalink] 16 May 2012, 00:44
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Which of the following most logically completes the passage?

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