In the servlet page controller for the JSP, delegate to the Model to fetch the information for the drop down. Place the information into request scope as a List or Map. In the JSP, use the JSTL and EL to create the drop down options.
Write some code and let us know where you have difficulties.
One more thing: figure out what the HTML for this drop-down list should look like. It might help to write it down on a piece of paper, or something like that. Then make sure you write your JSP so that it generates that HTML.