The interstitial nucleus, a sub-region of the brain’s hypothalamus, is

(A) The first is a fact in support of the consideration that is one of two points of this argument; the second is the alternative point that weighs against the first.
i haven't still figured out the first point however the second one is correct since it opposes the fact that the hypothalmus disease affect the hypothalmus and not that the size of the hypothalmus is the cause contracting the disease hence out as first half doesn't make sense

(B) The first is an evidence that supports the consideration that the argument includes; the second is the fact that weighs against that consideration that could be drawn from the first.'
Yes this everthing the bold face tries to convey first is part of the argument it affects the male cats when autopsed had large brain andthe second oppose the size was not the criteria for contacting the disease but the disease altered the size
hence lets hang onto B


(C) The first is a general principle that is against the conclusion; the second is that conclusion.
Thie premise is not agaignst the conclusion rather seeking to establish the conclusion


(D) The first is an evidence that supports the conclusion; the second is an exceptional example.
First is a premise the argument is supplying and second is not an example just another premise oppposing the conclusion that the size of the hypothalmus is not the deciding factor


(E) The first is a fact in support of the conclusion that the argument depends on; the second is a fact that is against the first one.
This one was hard to eleminate yes the first half is correct the second half doesn't oppose the first one however is another premise in opposition with the conclusion

hence IMO B

Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.