Do you automatically get either the sales tax or income tax deduction? Turbo tax automatically gave me a sales tax deduction - i live in Tx and we have no state tax.

I was completing my tax return and turbo tax automatically gave me the state sales tax deduction.  we live in Texas where there is no state income tax.  WE did not buy a major purchase (car, boat) so why is Turbo tax giving me this deduction?