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': 'Most common bony tumor of the middle ear is - \nSelect and explain. \nA. Adenocarcinoma, B. Squamous cell carcinoma, C. Glomus tumor, D. Acoustic neuroma', 'role': 'user'}, {'content': 'Answer: B \nExplanation: None', 'role': 'assistant'}]