The body of anyone infected by virus X will, after a week, produce ant

Question

The body of anyone infected by virus X will, after a week, produce antibodies to fight the virus; the antibodies will increase in number for the next year or so. There is now a test that reliably indicates how many antibodies are present in a person's body. If positive, this test can be used during the first year of infection to estimate to within a month how long that person has had the virus.
Which one of the following conclusions is best supported by the statements above?

Which one of the following conclusions is best supported by the statements above?

(A) Antibodies increase in number only until they have defeated the virus.
(B) Without the test for antibodies, there is no way of establishing whether a person has virus X.
(C) Antibodies are produced only for viral infections that cannot be fought by any other body defenses.
(D) If a person remains infected by virus X indefinitely, there is no limit to the number of antibodies that can be present in the person's body.
(E) Anyone infected by virus X will for a time fail to exhibit infection if tested by the antibody test.

Kelzie01 · Accepted Answer

(A) Antibodies increase in number only until they have defeated the virus.  The statements say nothing about how or if the virus is defeated. 
(B) Without the test for antibodies, there is no way of establishing whether a person has virus X.  There very well could be other symptoms or tests-not addressed. 
(C) Antibodies are produced only for viral infections that cannot be fought by any other body defenses.  Not mentioned in the statements why antibodies are produced. 
(D) If a person remains infected by virus X indefinitely, there is no limit to the number of antibodies that can be present in the person's body.  We are told nothing about how many antibodies can be present. 
(E) Anyone infected by virus X will for a time fail to exhibit infection if tested by the antibody test.  We ARE told that for the first week, the body produces no antibodies. Therefore the test that reads the amount of antibodies will fail to exhibit infection if the person is tested in that window. Correct answer.

KarishmaB · Answer

In anyone, antibodies will be produced after a week. 
Antibodies will increase in number for the next year or so (after that, we don't know)
There is now a test that reliably indicates how many antibodies are present in a person's body. 
If positive, this test can be used during the first year of infection to estimate to within a month how long that person has had the virus.

Which of the following is true?

(A) Antibodies increase in number only until they have defeated the virus.

We don't know. We just know that for a year, they keep increasing in number.

(B) Without the test for antibodies, there is no way of establishing whether a person has virus X.

The argument doesn't tell us anything about this. There may be other ways too.

(C) Antibodies are produced only for viral infections that cannot be fought by any other body defenses.

Again, not known. Perhaps other defences get involved too. We don't know the conditions under which antibodies are produced.

(D) If a person remains infected by virus X indefinitely, there is no limit to the number of antibodies that can be present in the person's body.

Can't say. Though, the argument does tell us that the number of antibodies increase for a year. Perhaps, after that the number doesn't increase.

(E) Anyone infected by virus X will for a time fail to exhibit infection if tested by the antibody test.

Correct. The antibodies are produced after a week. So for a week, the person will fail to exhibit infection if tested by antibody test (some other test may still show infection)

Answer (E)

Konstantin1983 · Answer

Still wonder why E is correct answer. But yeah looks like it is. D is out because we don't know how long antibodies can increase in number

kanigmat011 · Answer

WHy is C incorrect?
I feel it also has good chances

Kelzie01 · Answer

Well, the statements don't really mention anything contained in Option C. All we know is that this particular virus will cause the body to produce antibodies in a week, which will increase for the next year or so. Nothing is mentioned about the virus being fought by other body defenses, so we can't say that conclusion is supported by the statements.

AryamaDuttaSaikia · Answer

"C" is not the conclusion that can be derived from the given statements. In conclusion questions remember the conclusion has to be derived from the premise. "C" states an additional fact . By stating the given facts that is not the claim of the author. The conclusion is the increased number of antibodies provide immunity;hence the infection will not be exhibited in the infected which is what is stated in "E".

Basim2016 · Answer

Hi, 
This is another example of a simple looking CR question can be so hard to solve , just because of the ordinary looking info "after a week". OMG, I need a microscopic review to solve such tough question. One thing is for sure, CR is like facing an expert leg break googly bowler in cricket, that too on a wet pitch. 
More learning every day, more bookmarks, 
Thanks bb and VeritasKarishma.
Regards, 
Basim.

Posted from my mobile device

CEdward · Answer

The body of anyone infected by virus X will, after a week, produce antibodies to fight the virus; the antibodies will increase in number for the next year or so. There is now a test that reliably indicates how many antibodies are present in a person's body. If positive, this test can be used during the first year of infection to estimate to within a month how long that person has had the virus.
Which one of the following conclusions is best supported by the statements above?

Which one of the following conclusions is best supported by the statements above?

(A) Antibodies increase in number  only  until they have defeated the virus. X
-extreme language...we can't infer this from the stated passage
(B) Without the test for antibodies, there is  no way  of establishing whether a person has virus X. X
-extreme language again...we don't know whether there ARE NOT other ways 
(C) Antibodies are produced  only  for viral infections that cannot be fought by any other body defenses.
-extreme language again...we don't know whether antibodies are produced even when other defenses in the body do fight off infactions
(D) If a person remains infected by virus X indefinitely, there is  no limit  to the number of antibodies that can be present in the person's body. X
-extreme language AGAIN...we don't know this
(E) Anyone infected by virus X will for a time fail to exhibit infection if tested by the antibody test. 
 CORRECT...what about that first week?

bidskamikaze · Answer

Great question.
Option E jumps out to me.
The passage says that the antibodies are produced AFTER one week of infection. If test is conducted during this first week, the subject will fail to exibit infection in this test.
E is the correct option.

Thekingmaker · Answer

These are the Cr questionns that are beyond redemption, now to the question in matter it had indicated initially that The passage says that the antibodies are produced after one week of infection.
The body of anyone infected by virus X will, after a week, produce antibodies to fight the virus; the antibodies will increase in number for the next year or so. There is now a test that reliably indicates how many antibodies are present in a person's body. If positive, this test can be used during the first year of infection to estimate to within a month how long that person has had the virus. 
E is the correct option.

SafSin28 · Answer

QS: Must be true.

Argument:
1. If infected by virus X, then antibodies after a week: the antibodies will increase for the next year. 
2. There is a test that reliably indicates how many antibodies are present. 
3. If positive, this test can be used during the first year of infection to estimate to within a month how long that person has had the virus. (Plan= Conclusion)---> Why within a month not after a week?

(A) Antibodies increase in number only until they have defeated the virus. ----> Does this explain why within a month? But this says you can check it till the virus is no left. So Weakens. 
(B) Without the test for antibodies, there is no way of establishing whether a person has virus X.----> Does this explaining why within a month not a week? No, OUT. 
(C) Antibodies are produced only for viral infections that cannot be fought by any other body defenses.---> Describe antibodies. So OUT. 
(D) If a person remains infected by virus X indefinitely, there is no limit to the number of antibodies that can be present in the person's body.----> Indefinitely? But we are told for a year. OUT. 
(E) Anyone infected by virus X will for a time fail to exhibit infection if tested by the antibody test.---> It says there is some time between after a week and a month. So Correct.

The body of anyone infected by virus X will, after a week, produce ant

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The body of anyone infected by virus X will, after a week, produce ant

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