Hey IMO-C

What is the source??

this is from a LSAT doc..

the ans is D

I am caught between D & E.

IMHO - E it has to be E as there is not linkage between head-cold and sinus.

I got D.

E is irrelevant - packaging has nothing to do with anything - this answer relates price to package, not price or package to effectiveness. You need an element of effectiveness to weaken the conclusion - which is that SineEase is the most effective for the price.

C - consulting a doctor doesn't weaken the conclusion that SineEase is a best buy.

B - Proves nothing. That's like trying to say "I'm as good at basketball as Michael Jordan because we both have active limbs in 2 arms and 2 legs."

A - This proves nothing because it pretty much restates one of the claims in the stimulus - that most sinus medications have equal effectiveness. Since it doesn't speak to the price, and we know that SineEase costs the lease per dose in its class of products, it doesn't weaken the conclusion.

D has to be the answer because it gives an alternative effectiveness to SineEase. The conclusion in the stimulus is that SineEase is the best buy, but in answer choice D, it suggests that head cold medicine has the exact same composition but at a lesser price, which would most seriously weaken the given conclusion. SineEase is the cheapest per dose in "medications marketed for the relief of sinus headache." The conclusion specifically says "For relief from sinus headaches, SineEase is the best buy." If you can show that another medicine will relieve sinus headaches just as effectively but for a cheaper price, such as D, then it weakens the conclusion. It doesn't matter that it's a head cold medicine because the stimulus concludes that it's the best value for sinus headaches period, not just within medicines marketed for sinus headache.

I am pretty sure that the right Answer is D