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
Which of the following is gold standard for the diagnosis of minimal bronchiectasis 
Select and explain. 
A. Bronchography, B. Plain CT scan, C. X-ray chest, D. CT scan with contrast
B: Plain CT scan
Answer: B: Plain CT scan 
Explanation: Ans. Plain CT scan