There was a similar thread few months back if I understood your problem correctly. Is it some sort of a survey and you want to pick up some random questions and random answers per question?
BTW, trying to find that thread I found this interesting blog
http://thehobt.blogspot.com/2009/03/check-your-lucky-numbers-random-number.html
Premature optimization is the root of all evil in programming. (c) by Donald Knuth
Naomi Nosonovsky, Sr. Programmer-Analyst
My blog
