**Core Concept**
Bronchiectasis is a chronic respiratory disease characterized by irreversible dilation of the bronchial tree due to chronic inflammation, infection, and damage to the bronchial walls. This leads to impaired clearance of mucus and bacteria, resulting in recurrent infections and progressive lung damage.

**Why the Correct Answer is Right**
The pathophysiology of bronchiectasis involves a complex interplay of factors, including chronic inflammation, neutrophilic infiltration, and the production of mucus plugs. The bronchial walls are damaged, leading to a loss of the normal ciliated epithelium and the presence of dilated bronchi. This results in impaired mucociliary clearance, allowing bacteria and mucus to accumulate and perpetuate the cycle of infection and damage.

**Why Each Wrong Option is Incorrect**
* **Option A:** Thickened bronchial walls are indeed a characteristic feature of bronchiectasis, as they result from chronic inflammation and fibrosis.
* **Option B:** Mucus plugging is a hallmark of bronchiectasis, as the damaged bronchial walls are unable to clear mucus and bacteria effectively.
* **Option C:** Recurrent infections are a common complication of bronchiectasis, as the damaged bronchial tree provides a fertile ground for bacterial colonization and infection.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of bronchiectasis is the presence of a persistent cough, often productive of copious amounts of purulent sputum. This is due to the impaired mucociliary clearance and the chronic inflammation that characterizes the disease.

**Correct Answer: C. Recurrent infections are a common complication of bronchiectasis.