Question

what condition is associated with mucus production greater than 3 months per year for at least 2 consecutive years?
asthma
emphysema
chronic obstructive lung disease
chronic bronchitis

Explanation:

Chronic bronchitis is defined by mucus - production greater than 3 months per year for at least 2 consecutive years. Other conditions like asthma, emphysema, and chronic obstructive lung disease do not have this specific mucus - production - based definition.

Answer:

Chronic bronchitis