This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
Carpometacarpal joint of thumb is 
Select and explain. 
A. Saddle, B. Hinge, C. Ball and socket, D. Pivot
A: Saddle
Answer: A: Saddle 
Explanation: First carpometacarpal joint is only carpometacarpal joint which has separate joint cavity. Aicular surfaces are distal surface of trapezium and proximal surface of the base of the first metacarpal bone. B D Chaurasia 7th edition Page no: 161,162