JSFiddle - React, Tailwind, and code Playground

HTML

<table>
  <tr>
    <td nowrap="true" valign="top" width="113px" class="ms-formlabel">
      <h3 class="ms-standardheader"><a name="SPBookmark_Category"></a>Category</h3></td>
    <td valign="top" class="ms-formbody" width="350px" id="SPFieldChoice">
      <td width="350" class="ms-formbody" id="SPFieldChoice" valign="top">
        <!-- FieldName="Category"
         FieldInternalName="Category"
         FieldType="SPFieldChoice"
      -->
        Health &amp; Fitness &amp; sdfsdf
      </td>
    </td>
    </td>
  </tr>

</table>

JavaScript

alert($('td#SPFieldChoice').text().replace(' &amp;','_'));