Required survey question blocks my submission

Edit Subject

On the http://www.ghostery.com/help/firefox page at the yop is a link to a survey to help Ghostery improve. It has a question on what best describes employment status.
One possible answer is "Disabled, not able to work". This is my status. I can't submit the survey as there is a required question asking what industry one works in with no possible answer as: n/a, none, disabled, etc.