You can create a Sweepstakes that will provide you an option to have customized questions that the user can answer. You can choose the following question formats:
- Allow user to type text in text box.
- Choose an answer from the drop down.
- Select one of the answers listed using radio buttons.
- Choose multiple answers using check boxes.
- Choose Trivia, this would allow you to specify the correct answer among the options provided to the user.
You can also make the question compulsory or optional.