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
[{'content': 'Investigation of choice for nasopharyngeal angiofibroma? \nSelect and explain. \nA. X-ray, B. MRI, C. Plane-CT, D. CT- contrast', 'role': 'user'}, {'content': "Answer: D \nExplanation: Ans. is'd'i.e., CT contrastRef: Dhingra Sth/e p. 262CT scan of head with contrast enhancement is the investigation of choice for JNA.", 'role': 'assistant'}]