You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <random>
      <page id="515" ns="0" title="Natural Weight Loss Program - Picking The Ideal Program To Lessen Your Belly Bloat5702375" />
      <page id="91" ns="0" title="How to Make the Most of Your Family members Holiday seasons in Austria5725214" />
    </random>
  </query>
</api>