This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory, Subject name: Medicine
Imaging modality for confirming the diagnosis of hronchieactasis is - 
Select and explain. 
A. Chest CT Scan, B. MRI chest, C. X - ray Chest, D. Bronchoscopy
A: Chest CT Scan
Answer: A: Chest CT Scan 
Explanation: Ans. is 'a' i.e., Chest CT Scan Investigations of choice in respiratory systemDiseaseInvestigation* Intersitial lung disease* Bronchiectasis* HRCT* HRCT (1st choice)* Bronchography (2nd choice)* Pulmonary embolism* CT with i.v. Contrast (1st choice)* V/Q scan (2nd choice)* Solitary pulmonary nodule* Calcification* Pulmonary malignancy* Superior sulcus or pancoast tumor* CT scan* CT scan* CT scan (except in superior sulcus or pancoast tumor)* MRI