You've done some good things with the QA markup. 
* You've kept it consistent
* You marked up the Qs different than the As

However there are some things I'd like to see changed. You really want to accomplish a few things with the markup of the questions and answers:
 

1. show that the question and answer are a pair (related elements).
2. Have something be different between the two so that you can style the questions differently than the answers.
3. Use semantic markup as much as possible.

I should say up front that there is no perfect answer for how to mark up this assignment &mdash; see [this discussion](http://www.sitepoint.com/forums/showthread.php?695009-Appropriate-Markup-for-a-Question-and-Answer-List). There is no Q&A element in HTML5. So I'm more looking that you have made an effort to do the three things above.

You got 2, but 1 and 3 need some work. In terms of 3, semantics, making them both paragraphs and just differentiating with i around the question doesn't say a lot about the content.  A quick tip is that if you find yourself adding something like b, i or span around the entire contents of an element then usually it's better to just add a class to the element ( like ````<p class="question">````). There are other ways to go here but just FYI.

Knowing there is no perfect answer here are a couple of other options:


````
<section class="QA">
    <h3>question</h3>
    <p>answer</p>
</section>
<section class="QA">
    <h3>question 2</h3>
    <p>answer 2</p>
</section>
````
If you want to keep them in a list one way would be to use a definition list, [sitepoint reference](http://reference.sitepoint.com/html/elements-list)
````
<dl>
    <dt>Question here</dt>
    <dd>answer</dd>
    <dt>Question  2 here</dt>
    <dd>answer 2</dd>
</dl>
````
Or divs would be acceptable (with a class for the divs)

````
<div class="QA">
    <h3>question</h3>
    <p>answer</p>
</div>
<div class="QA">
    <h3>question 2</h3>
    <p>answer 2</p>
</div>
````

All of these address each of the three concerns.