This is a *very* subtle (and hard to remember) difference, but the heading for an answer is **bolded** and slightly lighter [in colour] than the heading for a question

> ###Question
>
> ![enter image description here][1]

<p />


> ###Answer
>
>![enter image description here][2]

For easier comparison, I've placed them side by side below:

> ![enter image description here][3] <sup>(question)  </sup>  
> ![enter image description here][4] <sup>(answer)  </sup>  

--------

The same difference is also in your [Review History tab](http://askubuntu.com/review/suggested-edits/history):

> ![enter image description here][5]


  [1]: https://i.sstatic.net/DVV9H.png
  [2]: https://i.sstatic.net/FnNhA.png
  [3]: https://i.sstatic.net/M7sxx.png
  [4]: https://i.sstatic.net/tZ4ve.png
  [5]: https://i.sstatic.net/xxdqj.png