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
The axis of abduction and adduction of digits passes through the centre of 
Select and explain. 
A. 2nd metacarpal, B. 3rd metacarpal, C. 4th metacarpal, D. 5th metacarpal
B: 3rd metacarpal
Answer: B: 3rd metacarpal 
Explanation: The third metacarpal is the longest and the axis of abduction and adduction passes through its centre.Ref: Chaurasia; Volume 2; 6th edition; Page no: 31