title: Form a html_safe string in rails
body: <pre><code>link_to "hi",content_tag(:p,"hello")
  </code></pre>
  
  <p>produces me 
  <code>"&lt;a href=\"&amp;lt;p&amp;gt;hello&amp;lt;/p&amp;gt;\"&gt;hi&lt;/a&gt;"</code> 
  i don't want the escaped output. how to get a html_safe string?</p>