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: Radiology
[{'content': 'The best method to diagnose bronchiectasis: \nSelect and explain. \nA. X-ray, B. X-ray, C. MRI, D. HRCT', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Ans. HRCT', 'role': 'assistant'}]