Dropdown box for selecting a category and displaying more than 1 result

Hi,
I have a list of questions that need to be filtered by the user and i was looking for an effective way to do it.

Column A is the question number
Column B is the Question Category
Column C is the actual question.

The user wants to use a dropdown box and select the question category. the results they will get are the question number and the question.

- there may be several questions within a category so all questions need to be displayed for the category that is selected.

(I havnt explored the use of a list as it gives the user the chance to display all the questions and i am trying to keep the viewing space that this list takes up to an absolute minimum).
Also i have mentioned a dropdown box as these are very familiar to the user and so they could use it without the risk of user error.

I have attached a list of the questions in the hope you have any suggestions.

thanks so much for your help in advance.