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
Medial wall of orbit formed by: 
Select and explain. 
A. Body of sphenoid, B. Lesser wing of sphenoid, C. Greater wing of sphenoid, D. All
A: Body of sphenoid
Answer: A: Body of sphenoid 
Explanation: A i.e., Body of sphenoid