I would probably use my standard hint, 16-digit alpha numeric data totally unrelated to the question. I am not in the F***b**k, Tw*t***, etc. so nobody would know them.Yes it activated as Windows 10 Pro automatically by the BIOS, but I don't see the connection you're trying to make.
After Windows 10 asks you for your name and your password (setting up the PC) it makes you pick 3 security questions and give answers for use in resetting your password if you forgot it. Of course the options for the questions are the sort that someone could find the answers for using the typical person's social media accounts or they're questions you won't remember the answer to. For example I have no idea what I would have answered was my favorite movie in 2002 or 2007 or even 2013.