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: Pathology
[{'content': 'Nasopharyngeal angiofibromas are most frequently seen - \nSelect and explain. \nA. In the second decade, B. In the third decade, C. In the fourth, D. In the fifth and sixth decades', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Nasopharyngeal angiofibroma is a highly vascular tumor that occurs almost exclusively in adolescent males.', 'role': 'assistant'}]