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
[{'content': 'Imaging study of choice for para nasal sinuses is? \nSelect and explain. \nA. USG, B. CT Scan, C. XrayPNS, D. FDG PET scan', 'role': 'user'}, {'content': "Answer: B \nExplanation: Ans. (b) CT ScanRef: Scott-Brown's Otorhinolaryngology: Head and Neck Surgery7ed p-1086", 'role': 'assistant'}]