how to get row from matrix follow a list of rule

I have a list of number, and i want to extract particular row from a list of row:

example:

% A = [1 2;
       3 4;
       5 6]
B = [1;
     3]

so C is the extracted matrix from A by row number in B

    % C = [1 2;
           5 6]

Answer 1

[KL]

   C = A(B,:)