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 is the investigation of choice for recurrent sinusitis? 
Select and explain. 
A. MRI, B. CT scan, C. X-ray PNS Waters view, D. X-ray PNS Cadwells view
B: CT scan
Answer: B: CT scan 
Explanation: Ans. is'b'i.e., CT scanCT scan is the investigation of choice for recurrent sinusitis.