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# Mullein has been employed as an expectorant for centuries and is still

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SVP
Joined: 12 Dec 2016
Posts: 1672
Location: United States
GMAT 1: 700 Q49 V33
GPA: 3.64
Mullein has been employed as an expectorant for centuries and is still  [#permalink]

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10 Dec 2017, 00:09
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00:00

Difficulty:

5% (low)

Question Stats:

94% (01:31) correct 6% (02:59) wrong based on 78 sessions

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Mullein has been employed as an expectorant for centuries and is still greatly praised for this purpose by herbalists. However, mullein roots and seeds are believed to contain rotenone, a compound that is used as an insecticide and fish toxin and that has been shown to be a causative factor in Parkinson's disease. Therefore, the use of mullein leaf tea for the treatment of dry coughs is not as safe as has previously been believed.

Which of the following would be most useful to know in order to evaluate the truth of the argument's conclusion?

A. Whether mullein roots and seeds are effective as pesticides
B. Whether mullein roots and seeds contain other toxic chemicals besides rotenone
C. Whether there are other agents besides rotenone involved in the etiology of Parkinson's disease
D. Whether there are safer herbs that are effective expectorants
E. Whether mullein leaves contain rotenone in sufficient quantities to contribute to Parkinson's disease

Explanation, the argument concerns mainly with rotenone, not with mullein roots and seeds => A is a trap, or a shell game.
Intern
Joined: 27 Nov 2017
Posts: 9
Re: Mullein has been employed as an expectorant for centuries and is still  [#permalink]

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10 Dec 2017, 00:25
if we evaluate E: even if we negate the role of rotenone in causing parkinsons disease,it still is an insectiside and thus harmful..which leaves D as best possible choice...OA please

Sent from my Moto G (5) Plus using GMAT Club Forum mobile app
SVP
Joined: 12 Dec 2016
Posts: 1672
Location: United States
GMAT 1: 700 Q49 V33
GPA: 3.64
Re: Mullein has been employed as an expectorant for centuries and is still  [#permalink]

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10 Dec 2017, 21:20
superthapli wrote:
if we evaluate E: even if we negate the role of rotenone in causing parkinsons disease,it still is an insectiside and thus harmful..which leaves D as best possible choice...OA please

Sent from my Moto G (5) Plus using GMAT Club Forum mobile app

OA is E. There is an explanation in my post.
D is wrong b/c D is out of scope. D is also an important pattern. D talks about whether there are safer ingredients while the argument concerns only with the rotenone and the traditional belief about the safety and benefits of rotenone.
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kudos if you find the post helpful. Thank you
Re: Mullein has been employed as an expectorant for centuries and is still &nbs [#permalink] 10 Dec 2017, 21:20
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