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': 'MC tumour in posterior mediastinum is: March 2013 \nSelect and explain. \nA. Neurofibroma, B. Teratoma, C. Lymphoma, D. Bronchogenic cyst', 'role': 'user'}, {'content': 'Answer: A \nExplanation: Ans. A i.e. Neurofibroma Tumours associated with neurofibroma MC tumour associated with neurofibromatosis-I: Optic nerve glioma Feature of neurofibroblastoma-II: Bilateral acoustic neuroma', 'role': 'assistant'}]