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 foot plate 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.\nMnemonic : SORT :\xa0\n\n* Stapes (footplate) covers\xa0\n\xa0 Oval window\n*Round window is covered by\n\xa0Tympanic membrane (Secondary)', 'role': 'assistant'}]