[Quoth]

Or simply use a style with Page Break Before in the Wordprocessor at the start of each answer. Don't make it a heading style unless you want it in the TOC.

I've never needed to explicitly decide file breaks. Calibre does it fine with a properly styled DOCX as input source.

There was originally in Mobi, recognised by Mobi creator if you used HTML source, a tag that meant don't page past here, so you COULD make parts of the ebook accessible only via links. I tested this years ago with MS Word 2002 on XP:
1) Export as HTML*
2) Clean ghastly MS generated HTML
3) Add the no page tags.
4) Import into Mobi Creator.

At the time I only had a Mobi viewer for XP, which I read gutenberg on. No suitable smart phone, tablet or eink till years later. I gave up on the idea of doing the Plot Your Own Adventure because there was no mechanism to score. A Client Side HTML image map would have been nice too. Crazy that epub2 and KF8 never added it.

* Back then OpenOffice Writer generated better / cleaner HTML. But import of MS Word wasn't great then. Import of doc or docx to LibreOffice Writer today depends on how insane the Word doc formatting is. LO does better HTML and PDF than Word2007, but Sigil or Calibre make better epub2 than the LO plugin or built in.