- Wed Aug 13, 2014 6:22 pm
#15909
Hi est15!
Histamine plays no role in the processes by which colds produce their symptoms, but that doesn't mean that antihistamines are definitely ineffective against congestion caused by colds. We know from the third sentence that "antihistamines have other effects." We don't know what all of these other effects are (drowsiness is just one of them) but, from what we're told in the stimulus, it's possible that one of these other effects might have an effect on the congestion caused by colds.
Answer choice (E) must be true because if antihistamines do have some effect on reducing cold symptoms, it has to be one of the "other effects" of the antihistamines and not the result of blocking the action of histamine.
Hope this helps!
Best,
Kelsey