In a Cohort Study of Smoking and Myocardial Infarction in City

Multiple Choice

In a cohort study of smoking and myocardial infarction in City A,the number of myocardial infarctions were 250 cases among 7,000 smokers and the number of myocardial infarctions were 150 cases among 20,000 nonsmokers.From another source,a cross-sectional study,we know that 30% of the total population in City A were smokers.What is the population proportion attributable risk of smoking in City A?

A) 15%
B) 30%
C) 53%
D) 79%
E) 90%