**Question:** Parents of a child with bronchiectasis may give a past history of:

A. Respiratory infections
B. Asthma
C. Cystic Fibrosis (CF)
D. Lung trauma or surgery

**Core Concept:**
Bronchiectasis is a chronic lung condition characterized by irreversible widening and distortion of the airways, leading to impaired lung function and recurrent respiratory infections. It is caused by various factors including genetic disorders like CF and lung trauma or surgery, as well as post-infectious sequelae and autoimmune diseases.

**Why the Correct Answer is Right:**
In this case, the correct answer is option C (Cystic Fibrosis) because cystic fibrosis (CF) is a well-known genetic disorder that can lead to bronchiectasis due to thick mucus production and impaired mucociliary clearance. This makes the airways more prone to bacterial colonization and infections, which are a common cause of bronchiectasis.

**Why Each Wrong Option is Incorrect:**
A. Respiratory infections are indeed a significant cause of bronchiectasis. However, they are not the only cause, as seen in option C (Cystic Fibrosis).
B. Asthma is a respiratory condition characterized by airway inflammation and narrowing, not bronchiectasis. Though both conditions can lead to recurrent respiratory infections, asthma is not a direct cause of bronchiectasis.
D. Lung trauma or surgery can result in bronchiectasis due to airway damage, but this is not the only cause, as seen in option C (Cystic Fibrosis).

**Clinical Pearl:**
It is crucial for physicians to consider the various underlying causes of bronchiectasis when examining a child, as appropriate management and treatment strategies depend on the etiology. In the case of a child with bronchiectasis, a thorough clinical history, including family history, should be taken and followed by appropriate investigations to identify the underlying cause.

**Correct Answer:** C. Cystic Fibrosis