huskers wrote:
Pharmacists recently conducted a study with respect to the reasons their customers purchased eye drops to soothe eye dryness. Dry eyes were more frequently experienced by customers who wore contact lenses than by customers who did not wear contact lenses. The pharmacists concluded that wearing contact lenses, by itself, can cause contact wearers to have dry eyes.
Which one of the following statements, if true, most seriously undermines the pharmacists' conclusion?
(A) An inherited condition can cause both weak eyesight and dry eyes.
(B) Physical exertion causes dry eyes in many people who wear contact lenses.
(C) Most people who have dry eyes do not wear contact lenses.
(D) Most people who wear contact lenses do not have dry eyes.
(E) Both weak vision and dry eyes cause headaches.
Hi,
this is how I did it:
You are looking for a cause and an effect. This is basic stuff. What will undermine the conclusion: well that some other cause produces the exact same effect.
Now state the conclusion in simple terms: "Wearing contact lenses cause dry eyes"
Look at the answer choices:
(A) An inherited condition can cause both weak eyesight and dry eyes.
correct(B) Physical exertion causes dry eyes in many people who wear contact lenses.
Not correct Irrelevant(C) Most people who have dry eyes do not wear contact lenses.
Not correct (trap)(D) Most people who wear contact lenses do not have dry eyes.
Not correct (trap)(E) Both weak vision and dry eyes cause headaches
Irrelevant Not correctOnly A undermines.
Now verify if it make sense:
"Wearing contact lenses cause dry eyes" ==> BUT
An inherited condition can cause both weak eyesight and dry eyes ==> Therefore, Contact lenses might cause dry eyes as well as an inherited condition can.
hih