Using Definition Lists: Question and Answer Formatting
http://www.cssnewbie.com/using-definition-lists-question-answer-formatting/

Coyier, Chris
CSSnewbie
2008

Abstract:

There are two big differences between unordered lists and definition lists. One, there are two different elements that belong in a definition list: dt’s & dd’s. In unordered lists, all you have is li’s. Two, the only default styling applied to definition lists is a bit of a left-margin to the dd elements — no bullets or other strange positioning to fight. Having two different tags to work with is what makes definition lists valuable.