This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Respiratory System, Subject name: Radiology
Investigation of choice in bronchiectasis 
Select and explain. 
A. MRI, B. HRCT, C. bronchoscopy, D. chest x-ray
B: HRCT
Answer: B: HRCT 
Explanation: Ans: b (HRCT)Second investigation of choice (earlier): Bronchography (not Bronchoscopy)HRCT signs:Honeycomb patternTram-track patternGrape cluster patternTooth paste patternSignet ring patternVery importantSome Investigations of choice:Bronchiectasis :HRCTRenal TB (early) :IVPRenal TB (advanced) :CT>IVPRenal calculus :Non contrast Helical CT scanDental pathology andTM joint pathology :pantamogramPregnant lady with upper abdominal mass :MRIPosterior urethral valve and VUR :MCU (Micturating cystourethrogram)Osteoporosis :DEXA