In developed countries, the most common cause of acquired bronchiectasis is:Group of answer choicesemphysemaCystic Fibrosislung abscesspulmonary fibrosis

The most common cause of acquired bronchiectasis in developed countries is Cystic Fibrosis.

Here's a step-by-step explanation:

1. Bronchiectasis is a condition where the bronchial tubes of your lungs are permanently damaged, widened, and thickened. These damaged air passages allow bacteria and mucus to build up and pool in your lungs. This results in frequent infections and blockages of the airways.

2. The causes of bronchiectasis can be congenital (meaning a person is born with it) or acquired (meaning it develops later in life).

3. In developed countries, the most common cause of acquired bronchiectasis is Cystic Fibrosis. Cystic Fibrosis is a genetic disorder that causes severe damage to the lungs and digestive system. It affects the cells that produce mucus, sweat and digestive juices, causing these fluids to become thick and sticky. Instead of acting as a lubricant, the secretions plug up tubes, ducts and passageways, especially in the lungs and pancreas.

4. While emphysema, lung abscess, and pulmonary fibrosis can potentially lead to bronchiectasis, they are not the most common causes in developed countries.