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': "Antoni A & Antoni B Pattern's are seen in \nSelect and explain. \nA. Schwannoma, B. Neurofibroma, C. Meningioma, D. Teratoma", 'role': 'user'}, {'content': 'Answer: A \nExplanation: Schwannoma *Distinctive histologic patterns seen within the peripheral nerve sheath tumor Schwan noma include the Antoni A and Antoni B regions oThese are the classic microscopic appearances of a schwannoma, which is benign. oNote the more cellular "Antoni A" pattern on the left with palisading nuclei surrounding pink areas (Verocay bodies). On the right is the "Antoni B" pattern with a looser stroma, fewer cells, and myxoid change. oNotice the whirly swirly pattern and how the cell nuclei are closely bunched together ... almost as if they\'re forming a fence (Verocay bodies). oSchwannomas are benign spindle cell tumors that occur along the edges of peripheral nerves.They can usually be removed without damaging the nerve itself.', 'role': 'assistant'}]