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It is difficult to find the precise causes of any disease [#permalink]
27 Sep 2005, 06:48
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67% (01:32) correct
33% (00:00) wrong based on 8 sessions
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It is difficult to find the precise causes of any disease resulting from B-Vitamin deficiencies. For example, it was known that being deficient in all the B-vitamins was sufficient to contract the disease beriberi, and also that beriberi was always accompanied by a deficiency of vitamin B1. However, recent human volunteers on special diets designed to lack only vitamin B1, did not contract the disease.
Which of the following if true best explains the results above?
A) Individuals whose diets lack vitamin B1 will contract beriberi only if they have a generally unhealthy diet.
B) A deficiency in vitamin B1 is not necessary to contract beriberi.
C) Beriberi can be cured by any variety of B-vitamin supplments
D) Berberi is caused by deficiencies in a combination of B-vitamins
E) Deficiencies in the B-vitamins have widely varying effects on different individuals, so that specific diseases cannot be adequately identified.
"being deficient in all the B-vitamins was sufficient to contract the disease beriberi" thus, the disease is caused by "deficiencies in a combination of B-vitamins" as D states. Besides Beriberi is always accompanied by a deficiency of B1 (it is necessary). B is out
B. B1 deficiency always led to beriberi, but this has been proven wrong by the results...... the results only refer to lack of B1. there are no results for other B vitamins. logically one should go with what strengthens the result
Answer choice (D) matches this prediction. If you need to be deficient in several B-vitamins in order to contract beriberi, it makes sense that the people in the study who didn’t take in any B1 did not contract beriberi – they were still getting plenty of the other B vitamins.
Choice (A) can’t be correct because it talks about “some” individuals, which is much too vague.
Choice (B) does nothing to help explain these strange results. It could very well be that vitamin B1 is necessary to cause beriberi. (That’s not the same thing as saying that it does cause the disease – remember, there could be other necessary factors as well.) Saying that B1 is necessary to cause beriberi does not explain why these people did not contract the illness – if anything, it deepens the mystery as to why they didn’t.
Choice (C) is out of scope – we don’t care what cures beriberi. (Not at the moment, anyway.)
And choice (E) does not specifically address this particular experiment and its originally confusing results. _________________
------------------------- -Aravind Chembeti
Re: It is difficult to find the precise causes of any disease
26 Feb 2012, 04:49