I hate the word divorced

So I signed up for my new benefits yesterday morning and I was thrown off guard when the lady asked me if I was single, married, or divorced. Can someone please tell me why anyone would need to know if you're divorced? Like what relevance does that have? Can't I just say I'm single? There were a few other things I've filled out before where they asked me the same questions and I just said single. But now I'm thinking about it again and I'm annoyed because to me there is no logical explanation of why they need to know about being divorced. It's like I have to be constantly reminded of it in one way or another. Ugh.