I have read tutorials about how to populate an entire Drop down list with MySQL, but the problem I am running into is that I only want to grab the one from the database and
In your element add the selected attribute for the value that is in itemschoice.
Crude example using a made up function to get the choice:
$choice = get_items_choice();
$results = mysqli_query($sql);
echo '';
This is just an example, don't copy & paste this without adding some kind of error verification!