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: ENT
A 12 years child presents with B/L nasal pink masses. Most important investigation prior to undertaking surgery is - 
Select and explain. 
A. Ultrasound, B. FNAC, C. Biopsy, D. Contrast C.T. Scan
D: Contrast C.T. Scan
Answer: D: Contrast C.T. Scan 
Explanation: CT scan of head with contrast enhancement is the investigation of choice for JNA.