A career in dermatology is still a safe bet for medical students. In the US., the number of cases of skin cancer linked to UV radiation in sunlight has remained relatively constant every year even though far fewer adults are intentionally exposing themselves to UV sunlight now than were doing so at the height of the suntan craze 20yrs ago

each of the following,if true could explain the relative stability in the incidence of skin cancer each year despite the decrease in intentional exposure to UV sunlight EXCEPT:

a) bcause of decreasing levels of ozone in the upper atmosphere,more people are now exposed accidently to excessive UV sunlight
b) people who continue to intentionally expose themselves to UV sunlight are absorbing larger doses of harmful radiation than the average suntanner did in the past
c) levels of UV radiation from sources other than sunlight are increasing every year
d) while fewer women are intentionally exposing themselves to UV sunlight,the number of men doing so has increased significantly





Can someone explain why B is wrong?
My logic is,
Say
earlier there were
Total number of people = 100 ( 60 intentionally exposing +40 other reasons ).

Now
Total number of people =100 ( 20 intentionally exposing +80 other reasons )

So ,now these 20 people can expose as much they can, but they cannot effect the total number.
Atleast they can not increase the total number.
So, Why B is wrong, when it is giving us information about intensity of exposure.
And cancer rate is no where in ques. Argument is only about total number of cases.

Looks to me that option A answers the question better.
Option D talks about number of men and women, both of whom should safely qualify as adults. And the passage does make a statement saying that the number of adults going in for an intentional exposure to UV due to sun-tan has decreased.
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GmatPrep1 [10/09/2012] : 650 (Q42;V38) - need to make lesser silly mistakes.
MGMAT 1 [11/09/2012] : 640 (Q44;V34) - need to improve quant pacing and overcome verbal fatigue.

Hi Rohit

You are missing a point. Only exposure does not cause cancer, large amount of doses cause cancer. Now read option B again. In the past the same people who intentionally exposed themselves were taking less doses, so no cancer to them. But now the people expose themselves for longer of time, so cancer.

Hope it helps !

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First Attempt 710 - first-attempt-141273.html