Currently Being ModeratedFeb 25, 2013 3:18 AM (in response to MeSlow)
You will have to choose the person yourself, or for them to each take a turn to answer, Keynote can not do that for you. If you need random generation of names you need to use another application such as Adobe Flash Pro or Adobe Director.
As to showing the question, place a text box on the slide and type it the text.
Keynote is an entry level presentation application, so you need to keep things simple.