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
The size of the Fenestra Vestibule on an average is- 
Select and explain. 
A. 3.50 mm long and 2.50 mm wide, B. 3.25 mm long and 1.75 mm wide, C. 3.75 mm long and 1.50 mm wide, D. 4.00 mm long and 2.00 mm wide
B: 3.25 mm long and 1.75 mm wide
Answer: B: 3.25 mm long and 1.75 mm wide 
Explanation: None