How to display the first item in a list... as the first item in a drop down box?

How to display the first item in a list... as the first item in a drop down box?

I've created a list from items stored in a form, sorted the list and placed it into a drop down box. "Everything works as expected".

I would like to display the first element in the sorted list as the default choice in the drop down box.

As it is now:



As I would like it to display:


I'm thinking the syntax should be something like --> input.Service_History = <sorted list> element (1) ;

Thank you for any help

Alan