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: Ophthalmology
The angle between medial wall and lateral wall of orbital cavity is 
Select and explain. 
A. 0°, B. 45°, C. 90°, D. 60°
B: 45°
Answer: B: 45° 
Explanation: The angle between medial wall and lateral wall of orbital cavity is 45°.