This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Pharynx, Subject name: ENT
A 12-year-old child presents with U/L pink nasal mass. Most important investigation prior to undertaking surgery is: 
Select and explain. 
A. Ultrasound, B. FNAC, C. Biopsy, D. Contrast CT scan
D: Contrast CT scan
Answer: D: Contrast CT scan 
Explanation: (d) Contrast CT scan(Ref. Cummings, 6th ed., 1422)An adolescent male with U/L pink nasal mass has to be investigated to rule out angiofibroma. So the next best investigation prior to undertaking surgery is a Contrast enhanced CT scan.FNAC and biopsy are contraindicated here for the fear of profuse bleeding.