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: Anatomy
Contents of the middle car cavity are all except: 
Select and explain. 
A. Malleus, B. Stapes, C. Chorda tympani, D. Cells of cord
D: Cells of cord
Answer: D: Cells of cord 
Explanation: None