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': 'Aberrant thyroid tissue may be found in all except: \nSelect and explain. \nA. Lingual thyroid, B. Thyroglossal ectopic thyroid, C. Struma ovarii, D. None', 'role': 'user'}, {'content': 'Answer: D \nExplanation: Usually there are 3 places where aberrant thyroid tissues may be formed:\ni) Lingual thyroid.\nii) Thyroglossal ectopic thyroid.\niii) Struma Ovarii\nStruma Ovarii is an ovarian teratoma in which thyroid tissue may be present.\xa0It is malignant.', 'role': 'assistant'}]