A 65-Year-Old Man Arrives to the Office Because His Family

A 65-year-old man arrives to the office because his family is concerned about his persistent cough after smoking. The patient inquires about the possibility of adult smokers having chronic obstructive pulmonary disease (COPD) . According to a recent cohort research, the relative risk (RR) of COPD for nonsmokers is 0.10 and for moderate smokers is 0.40 when compared to heavy smokers. The patient is a light smoker. According to the study, which of the following is the relative risk of COPD among moderate smokers vs nonsmokers?

A) 0) 10
B) 0) 25
C) 0) 40
D) 2) 5
E) 4
F) 10