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
Investigation of choice for nasopharyngeal angiofibroma 
Select and explain. 
A. X-ray, B. MRI, C. Plane-CT, D. CT-contrast
D: CT-contrast
Answer: D: CT-contrast 
Explanation: Computed tomography (CT) scan of the head with contrast enhancement is now the investigation of choice. It has replaced conventional radiographs. It shows the extent of a tumour, bony destruction or displacements. Anterior bowing of the posterior wall of maxillary sinus often called antral sign or Holman-Miller sign is pathognomic of angiofibroma (Ref: Diseases of Ear, Nose and Throat, P.L Dhingra, 7th edition, page 280)