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Advertisement:
For sinus pain, three out of four hospitals give their patients Novex. So when
you want the most effective painkiller for sinus pain, Novex is the one to
choose.

Which
of the following, if true, most seriously undermines the advertisement’s
argument?

(A) Some competing brands of
painkillers are intended to reduce other kinds of pain in addition to sinus
pain.

(B) Many hospitals that do not usually
use Novex will do so for those patients who cannot tolerate the drug the
hospitals usually use.

(C) Many drug manufacturers increase
sales of their products to hospitals by selling these products to the hospitals
at the lowest price the manufacturers can afford.

(D) Unlike some competing brands of
painkillers, Novex is available from pharmacies without a doctor’s
prescription.（D）

(E) In clinical trials Novex has been
found more effective than competing brands of painkillers that have been on the
market longer than Novex.

D, why? thanks

此题讨论不少，不是最后统一在c了吗？

文中说3/4的医院用n,————}n是最有效的。

要证明医院用跟药的有效性没关系。

很多药品都是低价卖给医院的， 因此医院的药大部分都是低价货，这才是削弱的根本。