The Nurse Interviews a Patient with a New Diagnosis of Chronic

The nurse interviews a patient with a new diagnosis of chronic obstructive pulmonary disease (COPD) . Which information is most specific in confirming a diagnosis of chronic bronchitis?

A) The patient tells the nurse about a family history of bronchitis.
B) The patient indicates a 30 pack-year cigarette smoking history.
C) The patient reports a productive cough for 3 months every winter.
D) The patient denies having respiratory problems until the past 12 months.