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': 'Bronchiectasis sicca is seen with: \nSelect and explain. \nA. TB, B. Peussis, C. Cystic fibrosis, D. Kaagener syndrome', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Bronchiectasis sicca- all features of bronchiectasis but absence of copious amount of sputum which is usually a hallmark of bronchiectasis. HRCT chest shows abnormal dilation of the tracheal bronchial tree ; it is present without infective sputum and occurs due to tuberculosis.', 'role': 'assistant'}]