Often, a patient does not show signs and symptoms of COPD until they are over 40 years of age because
A. renal blood flow is maintained at a normal rate until age of 40.
B. other health problems can trigger the signs and symptoms of COPD.
C. COPD is a result of the cumulative effects of smoking.
D. pulmonary function tests are not administered on young people.
E. people do not visit the doctor on a regular basis until they are elderly.
Answer: C
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