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': 'A 14-year old boy presents with histdeg. of frequent nasal bleeding. His Hb was found to be 6.4 g/dL and peripheral smear showed normocytic hypochromic anemia. The most probable diagnosis is: \nSelect and explain. \nA. Juvenile nasopharyngeal angiofibroma, B. Hemangioma, C. Antrochonal polyp, D. Carcinoma of nasopharynx', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. a. Juvenile nasopharyngeal angiofibroma A 14-year-old boy presents with history of frequent nasal bleeding. His Hb was found to be 6.4 g/dL and peripheral smear showed normocytic hypochromic anemia. The most probable diagnosis is juvenile nasopharyngeal angiofibroma', 'role': 'assistant'}]