This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Medicine
Investigation of choice for diagnosis of bronchiectasis 
Select and explain. 
A. Bronchoscopy with bronchoalveolar lavage, B. HRCT, C. Chest X-ray, D. MRI
B: HRCT
Answer: B: HRCT 
Explanation: HRCT is investigation of choice for diagnosis of bronchiectasis. High Resolution Computed tomography (HRCT) HRCT uses very thin 1-2 mm thin slices Q .
HRCT is used primarily to diagnose: Bronchiectasis Q Interstitial lung disease Q (Fibrosing alveolitis, asbestosis) Bronchiectasis Abnormal and permanent dilatation of bronchi Q .
The bronchial dilatation of bronchiectasis of is associated with destructive and inflammatory changes in the walls of medium sized airways,
often at the level of segmental or subsegmental bronchi.