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
Mobile bone of skull: 
Select and explain. 
A. Maxilla, B. Mandible, C. Ethmoid, D. Sphenoid
B: Mandible
Answer: B: Mandible 
Explanation: Temporomandibular joint is a synovial joint allowing free movements of mandible.