An option button is another method that can offer options for the users to choose. However, it is different from the checkbox. The different is that the checkbox offers multiple choices which means the users can choose more than one choice while the option button allows only one choice at a time, checking one option button automatically unchecked the other option buttons. The syntax for checked button is  Optionbutton=True  and for unhecked button is Optionbutton1=False .Here is the program about T-shirt's size selection that illustrates the usage of option buttons: