What exactly is a "qualified government retirement distribution"?

Turbotax is asking me if my retirement income from the Commonwealth of Massachusetts is a "qualified government retirement distribution." Unfortunately, Turbotax does not define what this phrase means and I could find no clear explanation online. It therefore must be a phrase only used by Turbotax. 

Turbotax does give examples, but the examples do not apply to me.

Turbotax should fix this flaw. In the meantime, I need a clear explanation of what is meant by "qualified government retirement distribution."  Qualified for what? What are the criteria?

Please, Turbotax, provide this information.

Thank you.