mysql - Automatic selection of form data in dropdown

I have below code to get the country and state details from the database. My issue is it should automatically select India and the state karnataka in the form. I have attached the screenshot for reference. While accessing form I should see Country as India and State as Karnataka. How this can be achieved?

          $con_sql ="SELECT     a.`id_country`, b.`name` AS `name`, `iso_code`, `call_prefix`, z.`id_zone` AS `zone`, a.`active` AS `active`
                        , z.`name` AS zone      FROM `country` a
                        LEFT JOIN `country_lang` b ON (b.`id_country` = a.`id_country` AND b.`id_lang` = 1)
                        LEFT JOIN `zone` z ON (z.`id_zone` = a.`id_zone`)
                         WHERE 1  ORDER BY b.`name` ASC";
        $con_res = mysqli_query($con, $con_sql);
          if($con_res !== null){
            while($row = mysqli_fetch_array($con_res))
            { echo ''.$row['name'].'';

           }} else { echo 'country is not available';


          }?>