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: Unknown
Not a part of medial wall of orbit 
Select and explain. 
A. Frontal bone, B. Ethmoid bone, C. Lesser wing of sphenoid, D. Tip of maxilla
A: Frontal bone
Answer: A: Frontal bone 
Explanation: None