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
Pt carpometacarpal joint is a type of ? 
Select and explain. 
A. Ellipsoid, B. Saddle, C. Condylar, D. Ball and socket
B: Saddle
Answer: B: Saddle 
Explanation: Ans. is 'b' i.e., Saddle