Which one of the following respiratory disorders is NOT caused by...

Chronic bronchitis is a long-term inflammation of the bronchi, primarily caused by prolonged exposure to respiratory irritants such as cigarette smoke, air pollution, or occupational dust and chemicals. It is a major component of chronic obstructive pulmonary disease (COPD) and is not caused by bacterial or viral infections.

In contrast, acute bronchitis, laryngitis, and sinusitis are frequently caused by viral or bacterial infections.

Answer: Chronic bronchitis