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
Investigation of choice for detection and characterization of interstitial lung disease is: March 2012 
Select and explain. 
A. MRI, B. Chest X-ray, C. High resolution CT scan, D. Ventilation perfusion scan
C: High resolution CT scan
Answer: C: High resolution CT scan 
Explanation: Ans: C i.e. High resolution CT scan Conditions and IOC MRI is IOC for superior sulcus/ pancoast tumour HRCT is IOC for interstitial lung disease and Bronchiectasis V/Q scan is 2"d IOC for pulmonary embolism (CT with I/V contrast is first IOC for pulmonary embolism)