This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nose and PNS, Subject name: ENT
Imaging study of choice for para nasal sinuses is? 
Select and explain. 
A. USG, B. CT Scan, C. XrayPNS, D. FDG PET scan
B: CT Scan
Answer: B: CT Scan 
Explanation: Ans. (b) CT ScanRef: Scott-Brown's Otorhinolaryngology: Head and Neck Surgery7ed p-1086