shoonya wrote:
Q30. The ancient Nubians inhabited an area in which typhus occurs, yet surprisingly few of their skeletons show the usual evidence of this disease. The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil. This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread. Thus, tetracycline in their food probably explains the low incidence of typhus among ancient Nubians.
Which of the following is an assumption on which the argument relies?
A. Infectious diseases other than typhus to which the ancient Nubians were exposed are unaffected by tetracycline.
B. Tetracycline is not rendered ineffective as an antibiotic by exposure to the processes involved in making bread and beer.
C. Typhus cannot be transmitted by ingesting bread or beer contaminated with the infectious agents of this disease.
D. Bread and beer were the only items in the diet of the ancient Nubians which could have contained tetracycline.
E. Typhus is generally fatal.
Guys, both B and E are compelling. I'm leaning more towards E. If Typhus is not fatal, one might not expect to find traces of this disease in the skeletons. So, E is the main assumption on which this whole argument is based. B is the secondary assumption (B could be true only if E is true).
comments are welcome.
Hi everyone, anyone with a similar line of reasoning check this.
Conclusion : tetracycline in their food probably explains the low incidence of typhus among ancient Nubians.
Premise : The ancient Nubians inhabited an area in which typhus occurs, yet surprisingly few of their skeletons show the usual evidence of this disease. The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil. This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread.
Now as per the explanation offered for E we can conclude that since typhus is fatal its incidence will be shown in the skeletons. But aren't we already given that....
their skeletons show the usual evidence of this disease this is non questionable since it is the part of the argument and there is no reason to doubt or bolster it.
As per the explanation offered by B, we can conclude that since tetracycline is not rendered ineffective as an antibiotic by exposure to the processes involved in making bread and beer, therefore tetracycline, an antibiotic produced by a bacterium common in Nubian soil that can flourish on the dried grain used for making two staples of the Nubian diet: beer and bread,
in their food probably explains the low incidence of typhus among ancient Nubians.
Hope this helps!