A cohort study of organochlorine pesticide exposure and cardiovascular disease (CVD) followed exposed agricultural workers and a comparison group of non-exposed workers, all employees of the same company, over a period of 25 years. Researchers found that the CVD incidence among exposed workers was 28.9 per 100,000. In the unexposed comparison cohort, the incidence of CVD was 6.3 per 100,000. You will need to calculate the relative risk of exposure to organochlorine pesticides and development of CVD. What is the relative risk of exposure to organochlorine pesticides and development of CVD