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Similarly, not dangerous and beneficial are more complimentary than contradictory.
When something is not dangerous, it isn't entirely opposite to say that it might be safe.

In my view "a conversation about a drug being dangerous or not" and "a conversation about how beneficial a drug is" are contradictory but I think you make a really good point.
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coreyander
Unlike physicians of the early twentieth century, many physicians now believe that fevers that range from 100° to 102° are not dangerous manifestations of disease organisms and are actually beneficial in ridding the body of viral infections.

A) many physicians now believe that fevers that range from 100° to 102° are not dangerous manifestations of disease organisms and are
B) many physicians now believe that fevers ranging from 100° to 102° are not dangerous manifestations of disease organisms but are
C) it is currently believed by many physicians that fevers ranging from 100° to 102° are not dangerous manifestations of disease and are
D) fevers ranging from 100° to 102° are believed by many physicians not to be dangerous manifestations of disease organisms but to be
E) many physicians currently believe that fevers that range from 100° to 102° are not the dangerous ones of diseased organisms, but are

______________________________________________________________________________________________________________________________________________________
Questions beginning with ‘like’ and ‘unlike’ are generally based on errors of comparison. At least one or two options can be negated on the basis of these errors.

In sentences that begin with ‘like’ or ‘unlike’, the noun that is present immediately after these words is the object of comparison.
Unlike physicians of the early twentieth century

The noun after the comma should also be the object of comparison.
Unlike physicians of the early twentieth century, many physicians


This sentence begins with the phrase “Unlike physicians of the early twentieth century”, so the comparison should be between “physicians of the early twentieth century” and “another group of physicians”. Based on this rule, we can eliminate Options C and D.

Option C has a passive construction that puts the pronoun ‘it’ after the comma, implying that ‘it’ is being compared with ‘physicians of the twentieth century’.

Option D has the noun ‘fevers’ after the comma, implying that the comparison is between ‘physicians ….. century’ and ‘fevers’.

Options A, B and E are similar to each other. The difference is that Option A has the conjunction ‘and’ and Options B and E have the conjunction ‘but’. According to the rules of parallelism of correlative conjunctions (conjunctions that are used in pairs), the correct idiomatic pair is ‘not-but’. So, Option A can also be eliminated.

Option E leaves out the word manifestations and also uses the word ‘diseased’ instead of ‘disease’, thereby changing the meaning of the sentence. Fevers do not belong to ‘diseased organisms’; they are a sign that there are disease organisms in the body.

Therefore, B is the most appropriate option.

Jayanthi Kumar.
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coreyander
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Unlike physicians of the early twentieth century, many physicians now believe that fevers that range from 100° to 102° are not dangerous manifestations of disease organisms and are actually beneficial in ridding the body of viral infections.

A) many physicians now believe that fevers that range from 100° to 102° are not dangerous manifestations of disease organisms and are

Contradictory result is shown in the above statement, hence putting conjunction for joining two contradicting statements is wrong. Eliminate A and C.

I'd like to disagree with the highlighted. The results are not contradictory.. The results will be contradictory only when the fever is Dangerous but also benefecial.. Whereas, here the fever is not dangerous and it is also beneficial. These are results are complimentary.

Take for example, The car isn't fast and is safe... You wouldn't say The car isn't fast but is safe.
Not fast and safe are complimentary and not contradictory. Fast and safe are contradictory.

Similarly, not dangerous and beneficial are more complimentary than contradictory.
When something is not dangerous, it isn't entirely opposite to say that it might be safe.

Hi,

That’s a very interesting point that you’ve made. The two ideas aren’t exactly contradictory.

In this sentence, I think it comes down to the rules of grammar, more specifically, the rules of parallelism.

Parallelism of correlative conjunctions (joining words that are always used in pairs) applies here. Since the word ‘not’ has been used, the word ‘but’ has to follow it idiomatically.
“many physicians now believe that fevers ranging from 100° to 102° are not dangerous manifestations of disease organisms but are”
The conjunction ‘and’ cannot follow ‘not’ when ‘not’ is being used as a conjunction.

In this sentence, the correlative conjunctions are used not so much for contradiction as for the purpose of negation.

Jayanthi Kumar.
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Hi experts,

B is definitely the correct answer, but isn't the idiom "...not x...but y"? And X and Y have to be parallel. We have x as a noun and y as a verb here. Is this not a hard rule to follow?
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