The most significant etiology for chronic obstructive pulmonary disease (COPD) is:
a. tobacco use.
b. chronic bronchitis.
c. exposure to carcinogens in the workplace.
d. emphysema.
ANS: A
Tobacco use or exposure is the most significant etiology for COPD and accounts for 80% to 90% of all cases of COPD. Exposure to certain chemicals in the work environment may be a causative factor of COPD but is not as significant as tobacco. COPD includes emphysema and chronic bronchitis.
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A) True B) False
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