Scroll down to selected option on button click using jquery

I have a list of countries like this:

The list is very extensive. I need to be able on a button click to move (focus) to the specified country.

There are many threads in StackOverflow but none of them worked. For example I tried this:

var code = 40;
$('#id_resource-regions').val(code).scrollTop(160);

There is no response and no error/warnings in the developers tool. Note that the list is created using django forms and templates.