Study of risk factors for lung cancer

/in /by

A longitudinal epidemiological study of risk factors for lung cancer was conducted. 500 smokers who smoked a pack of cigarettes for more than 30 years developed lung cancer, while 14,500 smokers did not develop lung cancer. In the same study, 50 cases of lung cancer occurred among people who never smoked. The remaining 29,950 who never smoked did not develop lung cancer.

 

What is the prevalence of lung cancer in the study?

a.    3.3%
b.    1.2%
c.    0.18%
d.    0.48%