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
Stapes foot plate covers - 
Select and explain. 
A. Round window, B. Oval window, C. Inferior sinus tympani, D. Pyramid
B: Oval window
Answer: B: Oval window 
Explanation: Footplate of stapes covers the oval window and secondary tympanic membrane covers the round window.
Mnemonic : SORT : 

* Stapes (footplate) covers 
  Oval window
*Round window is covered by
 Tympanic membrane (Secondary)