Question: He is presented with a cohort study involving 1000 female smokers and 2000 non-smoking women of the same age. If, after 5 years, 30 smokers and 20 nonsmoking women have experienced a stroke, what would be the relative risk and the attributable risk? 
 Options:  <1> Relative risk = 3, attributable risk = 10 out of every 1000. <2> Relative risk = 3, attributable risk = 20 out of every 1000. <3> Relative risk = 1.5, attributable risk = 10 out of every 1000. <4> Relative risk = 1.5, attributable risk = 30 out of 1000. <5> Relative risk = 10 out of 1000, attributable risk = 3.
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