This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Neoplasia, Subject name: Pathology
[{'content': 'Which is the nerve sheath tumor according to WHO? \nSelect and explain. \nA. Schwannoma, B. Paraganglioma, C. Medulloblastoma, D. Astrocytoma', 'role': 'user'}, {'content': "Answer: A \nExplanation: Ans. is 'a' i.e., Schwanomma * Schwannomas are benign tumors of the nerve sheath.* Schwannomas can arise from any peripheral nerve containing Schwann cells, including cranial nerves.* Although schwannomas can arise from any nerve in the body, the most common locations include the head, arms, legs and trunk.* The eighth cranial nerve is the most susceptible to schwannomas. Bilateral schwannomas of the eighth cranial nerve indicate the presence of type 2 neurofibromatosis.* Other benign nerve sheath tumors are neurofibromas and hemangiopericytoma.", 'role': 'assistant'}]