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: Dental
Basically TMJ is a: 
Select and explain. 
A. Ball and socket joint, B. Hinge and axis joint, C. Synovial joint, D. Diarthrodal joint
D: Diarthrodal joint
Answer: D: Diarthrodal joint 
Explanation: None