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
Bone better described as "bat with extended wings" is: 
Select and explain. 
A. Ethmoid, B. Sphenoid, C. Nasal, D. Mandible
B: Sphenoid
Answer: B: Sphenoid 
Explanation: None