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: ENT
[{'content': 'Fisch classification is used for classifying which of the following malignancy? \nSelect and explain. \nA. Paraveebral tumours, B. Glomus tumor, C. Synol sarcomas, D. Retroperitoneal tumours', 'role': 'user'}, {'content': 'Answer: B \nExplanation: The two grading systems which has been developed to classify glomus tumors are Fisch classification and Glasscock - Jackson classification. Fisch classification of glomus tumors: Class A: Tumors limited to the middle ear cleft. Class B: Tumors limited to the tympanomastoid area without destruction of bone in the infralabrynthine compament. Class C: Tumors extending into and destroying the bone of the infralabrynthine and the apical compaments of the temporal bone. Class D: Tumors with intracranial intradural extension.', 'role': 'assistant'}]