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: Surgery
Which of the following area is called a key area for orbital reconstruction: 
Select and explain. 
A. Antero medial wall., B. Postero medial wall., C. Anterolateral wall., D. Posterolateral wall.
B: Postero medial wall.
Answer: B: Postero medial wall. 
Explanation: None