This is a toy Android app that displayes two buttons marked "Yes" and "No" that, together, fill the screen. Press one and the Android text-to-speech will say the word. That's it.
Source code is available. It is made available under the GNU General Public License (GPL) v3, so you may use and modify the code, as long the source code to such modifications are made available.
The package is available on the Play Store, or you can download it here.