A 56-Year-Old Man Is Evaluated for Dyspnea, Wheezing, and Cough

A 56-year-old man is evaluated for dyspnea, wheezing, and cough productive of yellow sputum.  The patient reports that he has been treated with antibiotics when the dyspnea is severe.  He has smoked 2 packs of cigarettes daily for the past 25 years.  The schematic diagram below is a representation of a bronchial wall.  Which of the following ratios is the best pathological index to determine the severity of this patient's disease?

A) A / (A+B+C+D)
B) A / (A+B+C+D+E)
C) C / (B+C+D)
D) C / (A+B+C+D+E)
E) (B+C+D) / (A+B+C+D+E)

Correct Answer:

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