Focus your answer on the top two questions that you have had the most success with. Share what they were and why you thought they were successful. Perhaps you thought that their answers would lean towards a certain area due to the demographic but were shocked once you received the results.

If you have never performed research before or gotten a surprising response then don't make something up. Be honest and state that you don't have anything that is surprising. Maybe you have a question that has always been impactful or is your go-to when encountering a challenge.

"I have a question that I used in my recent research trying to understand demographic/population, and they were trying to figure out (question they wanted to be answered). A question that I asked on the survey was (insert question). We thought a majority would answer this way but found that they answered (say how they answered)."