How to remove question mark appearing in right side of the Menu bar in sharepoint website

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C#

Visual-Studio

SharePoint2010

Hi This is a simple question as i do not have much exposure in sharepoint
My query is:
A question mark appearing in the right side of the menu bar / navigation bar of my sharepoint website which is basically is for opening help window of sharepoint

here is the link of the image where you can understand better

http://postimg.org/image/wubglmrj3/[^]

Image link