How to change the text of the td using Jquery.?

Question

I have the td with a dropdown . I want to replace the "Activity class" text by "some other name" . please help me.

<td align="left" class="ItemLabel" classname="ItemLabel" style="width: 50%;">Activity class<br><select class="inputFieldClass" classname="inputFieldClass" id="QA_0-1-71" name="QA_0-1-71"><option value="">&lt;None&gt;</option><option value="15105">First Time Contact</option><option value="15106">Follow up</option></select></td>