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
[{'content': 'Investigation of choice for diagnosis of bronchiectasis \nSelect and explain. \nA. Bronchoscopy with bronchoalveolar lavage, B. HRCT, C. Chest X-ray, D. MRI', 'role': 'user'}, {'content': 'Answer: B \nExplanation: HRCT is investigation of choice for diagnosis of bronchiectasis. High Resolution Computed tomography (HRCT) HRCT uses very thin 1-2 mm thin slices Q .\nHRCT is used primarily to diagnose: Bronchiectasis Q Interstitial lung disease Q (Fibrosing alveolitis, asbestosis) Bronchiectasis Abnormal and permanent dilatation of bronchi Q .\nThe bronchial dilatation of bronchiectasis of is associated with destructive and inflammatory changes in the walls of medium sized airways,\noften at the level of segmental or subsegmental bronchi.', 'role': 'assistant'}]