Select options data from other tables

Need Help
1

I want to trace a disease with take from other table signs

table signs
+-----+-------------+
+ ID  + Gejala      +
+-----+-------------+
+  1  +  Bleeding   +
+  2  +  Swollen    +
+  3  +  Festering  +
+-----+-------------+

in table usertraces add.ctp, I'm expect output here

<?php
echo $this->Form->control('NoUser', array('type' => 'text', 'value' => $sesuserID));
echo $this->Form->control('Nama', array('type' => 'text', 'value' => $sesusernama));
echo $this->Form->control('Gejala', array('type' => 'select', 'value' => //the value I'm take from other table signs column Gejala));
echo $this->Form->submit('TAMBAH');
?>

how genereate query in usertracesController,
thanx for anyone to help me,…