Run, run for your life, Steve Jobs and Bill Gates, among many, are also drop outs.
If it is the former, I wouldn't think too much about it. People probably use standard forms for these purposes. If it is the latter, just tell him that you did school for some years and decided your time could be better spent outside school.
Thanks for your help.
P.S: For future reference, the best thing to do in this case it to mention as part of educational experience maybe the relevant courses you have taken and the amount of time spent at school. (If you need mention it at all).
For example, Jobs does not belong in the group of dropouts that Gates and Zuckerberg do. In the latter case, both were great students enrolled in one of the best schools in the country and dropped out once they had a reason to drop out (potentially huge idea.)