kentico get site cultures from macro

I'm using Kentico 11 and would like to get the current site's available site cultures using a Macro.I am trying to do this from a Page Type field's data source Macro Expression. I have set the data type to Text and the Form Control to Multi Select.The reason I am doing this is because our client has requested that some products only be available to specific site cultures (They are using site culture as locations).