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 for detecting minimal Bronchiectasis \nSelect and explain. \nA. Bronchogram, B. CT Scan, C. Radio nucleotide scan, D. Chest X Ray', 'role': 'user'}, {'content': 'Answer: B \nExplanation: B i.e. CT Scan High Resolution CT ScanQ with sensitivity 97% & specificity almost 100% has become the investigation of choiceQ. Investigation of IInd choice is BronchographyQ which is now occasionally used in recurrent hemoptysis when all other investigations are negativeQ, to demonstrate bronchopleural fistulas and congenital lesions such as sequestration & agenesis. It is C/I in massive hemoptysisQ, active infections (TB, pneumonia) & impaired pulmonary function.', 'role': 'assistant'}]