This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Bronchiectasis, Subject name: Medicine
[{'content': 'Persistent coarse crepitations in the chest are diagnostic of? \nSelect and explain. \nA. Pulmonary TB, B. Pulmonary edema, C. Cavity lesion, D. Bronchiectasis', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Fine crackles Coarse crackles Soft, high-pitched and very brief Louder, lower in pitch and last longer Indicates an interstitial process- pulmonary fibrosis or congestive hea failure. Indicates an airway disease- bronchiectasis.', 'role': 'assistant'}]