The death rate per 100,000 for lung cancer is 7 among non-smokers and 71 among smokers. The death rate per 100,000 for coronary thrombosis is 422 among non-smokers and 599 among smokers. The prevalence of smoking in the population is 55%. The relative risk of dying for a smoker compared to a non-smoker is: [Refer to the chapter titled “Study Designs: Cohort Studies”]   A. 9.1 for lung cancer and 0.30 for coronary thrombosis.   B. 10.1 for lung cancer and 1.4 for coronary thrombosis.   C. 10.1 for lung cancer and 8.4 for coronary thrombosis.   D. 9.1 for lung cancer and 1.4 for coronary thrombosis.   E. 12.4 for lung cancer and 1.7 for coronary thrombosis.

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