Extract minimum row value for every column in 2D matrix

A = [8 4; 3 6; 2 7; 1 4; 2 3;2 1;3 1; 3 5; 8 6; 8 1];

 B = sortrows(A);

I want to get the following output

ans = 2 1;

2 3;

1 4;

3 5;

3 6;

2 7

 I want to get only the minimum row for every column.
 I have 2 1 and 3 1 in the above array. Here  minimum row for column 1 is 2. so i want only 2 1 .
 Similarly i have elements 1 4 and 8 4 in the above array. Here  minimum row  for column 4 is 1. So i want only 1 4.

Please let me know how this is done in MATLAB

Looking forward to hear from you

Thanks

Pankaja