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: Unknown
A 35 year old male presented with nasal discharge, facial pain and fever which subsided with a course of antibiotics and antihistaminics, which recurred again after 2 months. O/E mucopurulent discharge from middle meatus, and inflammed sinus openings, investigationof choice 
Select and explain. 
A. X-ray PNS, B. NCCT PNS, C. MRI of the face, D. Inferior meatal puncture
B: NCCT PNS
Answer: B: NCCT PNS 
Explanation: Ans. is 'b' i.e. NCCT PNS * Findings are suggestive of maxillary sinusitis * NCCT is the investigation of choice