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': 'Stapes footplate covers: \nSelect and explain. \nA. Round window, B. Oval window, C. Inferior sinus tympani, D. Pyramid', 'role': 'user'}, {'content': 'Answer: B \nExplanation: Footplate of stapes covers the oval window and secondary tympanic membrane covers the round window.', 'role': 'assistant'}]