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': 'Best method to diagnose Bronchiectasis is – \nSelect and explain. \nA. X–ray, B. Bronchography, C. M.R.I., D. HRCT', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Investigation of choice for Bronchiectasis is HRCT.', 'role': 'assistant'}]