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Using new detection techniques, researchers have found trace

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Using new detection techniques, researchers have found trace [#permalink] New post 31 Mar 2012, 09:26
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Question Stats:

73% (02:08) correct 28% (00:57) wrong based on 120 sessions
Using new detection techniques, researchers have found trace amounts of various medicinal substances in lakes and rivers. Taken in large quantities, these substances could have serious health effects, but they are present in quantities far too low to cause any physiological response in people who drink the water or bathe in it. Nevertheless, medical experts contend that eliminating these trace amounts from the water will have public health benefits, since ____________.

A. Some of the medicinal substances found in lakes and rivers are harmless to humans in large quantities.
B. Some of the medicinal substances found in lakes and rivers can counteract possible harmful effects of other such substances found there.
C. People who develop undesirable side effects when being treated with medicines that contain these substances generally have their treatment changed
D. Most medicinal substances that reach lakes or rivers rapidly break down into harmless substances
E. Disease-causing bacteria exposed to low concentrations of certain medicinal substances can become resistant to them.


Here we have to choose the option which supports that removing medicinal substances from water will NOT have medical benefits

why option (B) is wrong and What is the explanation of correct answer
[Reveal] Spoiler: OA
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Re: medicinal substances [#permalink] New post 01 Apr 2012, 10:22
You've got it the other way round. You must choose the option that helps to establish that eliminating these substances from the water WILL have health benefits.

(B) provides an argument to let the substances stay, i.e. not remove them. Exactly the opposite of what we are looking for. Irrelevant.
(E) provides a clear explanation for why removing these substances will have health benefits.

Therefore (E) is correct.
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Re: medicinal substances [#permalink] New post 01 Apr 2012, 19:00
stuck with C why is it incorrect ?
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Re: medicinal substances [#permalink] New post 01 Apr 2012, 19:09
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Using new detection techniques, researchers have found trace amounts of various medicinal substances in lakes and rivers. Taken in large quantities, these substances could have serious health effects, but they are present in quantities far too low to cause any physiological response in people who drink the water or bathe in it. Nevertheless, medical experts contend that eliminating these trace amounts from the water will have public health benefits, since ____________.

C. People who develop undesirable side effects when being treated with medicines that contain these substances generally have their treatment changed
E. Disease-causing bacteria exposed to low concentrations of certain medicinal substances can become resistant to them.

C is incorrect because it has nothing to do with what we want here; basically we are searching for the information that conveys that even these small traces are harmful and hence deserves to be removed; C talks off the topic E properly identifies the required information supporting what we wanted.

Hope this helps..!!
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Re: Using new detection techniques, researchers have found trace [#permalink] New post 16 Sep 2013, 01:09
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Using new detection techniques, researchers have found trace amounts of various medicinal substances in lakes and rivers. Taken in large quantities, these substances could have serious health effects, but


Situation 1- they are present in quantities far too low to cause any physiological response in people who drink the water or bathe in it.

Situation 2 - Nevertheless, medical experts contend that eliminating these trace amounts from the water will have public health benefits

We need to find the solution which will resolve the paradox.

A. Some of the medicinal substances found in lakes and rivers are harmless to humans in large quantities. I incorrect . It simply states the premise
B. Some of the medicinal substances found in lakes and rivers can counteract possible harmful effects of other such substances found there. incorrect. Read carefully, mediccal substance counter other such substance. which is out of scope,and does not resolve the paradox
C. People who develop undesirable side effects when being treated with medicines that contain these substances generally have their treatment changed incorrect. it does not explain how eliminating these will have health benefits
D. Most medicinal substances that reach lakes or rivers rapidly break down into harmless substances incorrect, it weaken the Situation 2
E. Disease-causing bacteria exposed to low concentrations of certain medicinal substances can become resistant to them. Correct. this clearly mention how eliminating these substance will have health benefits. At the same time it question the validity of situation. Therefore, it clearly resolve the paradox.
Re: Using new detection techniques, researchers have found trace   [#permalink] 16 Sep 2013, 01:09
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