cnshahare wrote:
Certain messenger molecules fight damage to the lungs from noxious air by telling the muscle cells encircling the lungs’ airways to contract. This partially seals off the lungs. An asthma attack occurs when the messenger molecules are activated unnecessarily, in response to harmless things like pollen or household dust.
Which of the following, if true, points to the most serious flaw of a plan to develop a medication that would prevent asthma attacks by blocking receipt of any messages sent by the messenger molecules referred to above?
(A) Researchers do not yet know how the body produces the messenger molecules that trigger asthma attacks.
(B) Researchers do not yet know what makes one person’s messenger molecules more easily activated than another’s.
(C) Such a medication would not become available for several years, because of long lead times in both development and manufacture.
(D) Such a medication would be unable to distinguish between messages triggered by pollen and household dust and messages triggered by noxious air.
(E) Such a medication would be a preventative only and would be unable to alleviate an asthma attack once it had started
Official Guide for GMAT Verbal Review, 2nd EditionPractice Question
Question No.: 36
Page: 129
Difficulty: When poisonous air enters the lungs, messenger molecules tell the muscles to seal off the lungs partially. (So breathing would not be natural in this case)
In an asthma attack, the messenger molecules react to harmless things like pollen and tell the muscles to partially seal off the lungs. (One is unable to breathe well during asthma attack)
Plan: Develop a medication to block receipt of messenger molecules. Hence prevent asthma.
Which of the following, if true, points to the biggest weakness in the plan?
(A) Researchers do not yet know how the body produces the messenger molecules that trigger asthma attacks.
Irrelevant. The medicine just needs to block the messenger molecules. How they are produced may be of no significance.
(B) Researchers do not yet know what makes one person’s messenger molecules more easily activated than another’s.
Why asthma attacks occur is not a problem of the plan. The plan intends to prevent the attacks.
(C) Such a medication would not become available for several years, because of long lead times in both development and manufacture.
A long lead time to the success of the plan may not be a big deterrent to the plan itself.
(D) Such a medication would be unable to distinguish between messages triggered by pollen and household dust and messages triggered by noxious air.
Now this is a problem. If the medication cannot distinguish between messages triggered by pollen and messages triggered by poison, it will block all messages. So it will block the poison message too. Hence, when you do want the lungs to be partially sealed off, they would not be. This would damage the lungs.
(E) Such a medication would be a preventative only and would be unable to alleviate an asthma attack once it had started
The plan is to prevent an asthma attack, not alleviate an attack once it has started. This has nothing to do with the plan.
Answer (D)