This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
[{'content': 'Best diagnostic aid for Bronchiectasis is \nSelect and explain. \nA. Bronchoscopy, B. X-ray, C. Bronchography, D. CT scan', 'role': 'user'}, {'content': "Answer: D \nExplanation: (D) CT scan # Bronchography, the previous gold standard for diagnosing bronchiectasis, has been largely replaced by CT. Though, CT is not as sensitive as bronchography, it is considerably safer and can be done sequentially to follow the patient's course.> Thin-section high resolution CT (HRCT) may be needed. A CT scan after inhalation of xenon may prove even more sensitive.", 'role': 'assistant'}]