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: Surgery
[{'content': 'Testicular teratoma in adults is? \nSelect and explain. \nA. Benign, B. Malignant, C. Locally aggressive, D. Borderline', 'role': 'user'}, {'content': "Answer: B \nExplanation: Malignant REF: Robbin's 7th ed p. 1044 In children differentiated mature teratoma may be benign In post pubeal males all teratoma are regarded as malignant and capable of metastasis regardless the elements may be immature or mature.", 'role': 'assistant'}]