For working with select using AngularJS's ng-options if you need a custom title for each option, ng-options are not applicable. Instead of that, you can use ng-repeat with options.
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You can see the code below:-
<select ng-model="myVariable">
<option ng-repeat="item in items"
value="{{item.ID}}"
title="Custom title: {{item.Title}} [{{item.ID}}]"> {{item.Title}}
</option>
</select>