<prompt> Investigation of choice for diagnosis of bronchiectasisBronchoscopy with bronchoalveolar lavageHRCTChest X-rayMRI  <response>: 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. 