You would use the session variable reference if this value is held in a session variable and is not posted. Without more knowledge of how the pages are set up it is difficult to say what value you should use. Do you have a link to the live page where this can be seen?
Also, when I was making reference to the db I was referring to the choices the user is selecting from, not the choices they are making. For example, if you had a table for the items in your db and you had records that contained the corresponding values you could just reference that record with a recordset and get back all of the info associated with that option.
Like I mentioned, it can be pretty tricky getting more than a single piece of info back from a form with only one value. If you can post back with the pages in question I might have a better idea of what the interaction is and a way for you to get the values you need.