Presentation on any topic for a sales position...what topic to choose

I don't know what topic to choose. basically they told me to present for 15 minutes on any topic. It is for a software company. Do they want me to present on software/computers or any topic...really.

One hand I would like to present on something different then software because I don't want them to nail me to the wall during the Q&A. On the other hand will it look bad if I don't talk to software or sales? I really don't know what to do please help.