title: remove all options from select jquery but only one
body: <p>I have a select that contain this values:    </p>
  
  <pre><code>&lt;select id="lstCities" class="valid" name="City"&gt;
  &lt;option value="OSNY"&gt;OSNY&lt;/option&gt;
  &lt;option value="dd"&gt;dd&lt;/option&gt;
  &lt;option value="OSffNY"&gt;OSffNY&lt;/option&gt;
  &lt;option value="ANTONY"&gt;ANTONY&lt;/option&gt;
  &lt;option value="0"&gt;Autre...&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>How can I delete all options but i would like to keep only </p>
  
  <pre><code> &lt;option value="0"&gt;Autre...&lt;/option&gt;
  </code></pre>
  
  <p>My problem is my list is dynamic sometimes I have 3,5,7,.... select + the last one <code>&lt;option value="0"&gt;Autre...&lt;/option&gt;</code></p>