How can I make only admin could select a best answer

Question

I mean I don't want the users choose the best answer by themselves.

Only admin have the permission to choose.

Answer 1

In qa-page-question.php, change this line:

$post['aselectable']=($post['type']=='Q') && !qa_user_permit_error($post['isbyuser'] ? null : 'permit_select_a');

... to ...

$post['aselectable']=($post['type']=='Q') && !qa_user_permit_error('permit_select_a');