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The number of people diagnosed as having a certain bacterial

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The number of people diagnosed as having a certain bacterial [#permalink] New post 20 Oct 2010, 00:57
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Difficulty:

  35% (medium)

Question Stats:

74% (02:09) correct 26% (01:38) wrong based on 60 sessions
The number of people diagnosed as having a certain bacterial infection has dropped significantly in a rural county this year, as compared to last year. Health officials attribute this decrease entirely to improved sanitary conditions at water-treatment plants, which made for cleaner water this year and thus reduced the incidence of the disease.

Which of the following, if true, would most seriously weaken the health officials’ explanation for the lower incidence of the disease?

(A) Many new water-treatment plants have been built in the last five years in the rural county.
(B) Bottled spring water has not been consumed in significantly different quantities by people diagnosed as having the bacterial infection as compared to people who did not contract the disease.
(C) Because of a new diagnostic technique, many people who until this year would have been diagnosed as having the bacterial infection are now correctly diagnosed as suffering from intestinal ulcers.
(D) Because of medical advances this year, far fewer people who contract the bacterial infection will develop severe cases of the disease.
(E) The water in the rural county was brought up to the sanitary standards of the water in neighboring counties ten years ago.
[Reveal] Spoiler: OA
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Re: bacterial infections diagnosis puzzle [#permalink] New post 20 Oct 2010, 08:54
A?
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Re: bacterial infections diagnosis puzzle [#permalink] New post 20 Oct 2010, 11:33
Straight C.

This is because C provides an alternate reason for why lesser people are diagnosed with certain bacterial infection this year, compared to last year.
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Re: bacterial infections diagnosis puzzle [#permalink] New post 22 Oct 2010, 16:13
C.

But B is tricky to eliminate. Good question.
Re: bacterial infections diagnosis puzzle   [#permalink] 22 Oct 2010, 16:13
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