<?php
        $sql="SELECT * FROM pilihan WHERE LEFT (kdpilih,2) ='51'";
        $result=mysqli_query($conn,$sql);
        $rows=mysqli_fetch_assoc($result);
        echo "<select name='agama'>";
        foreach($rows as $row)
        echo "<option value='{$row['kdpilih']}'".($data['agama']==$row['kdpilih']?"selected":"") .">{$row['nmpilih']}</option>";
        ?>

erornya:
Warning: Illegal string offset 'kdpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'kdpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'nmpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'kdpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'kdpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'nmpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'kdpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'kdpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'nmpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52

Warning: Illegal string offset 'kdpilih' in D:\xampp\htdocs\upload\pegawai-ubah-form.php on line 52