We believe that our contribution should let you free from a problem so you can point forward to next step. Expect from us a professional work and our best effort and creativity.
Regarding this project, we asume you have some logic (May be in a backend or in the same App) which receives requests to compare user input with a list of correct answers. Our approach to solve the issue is to show buttons with different possible answers to the user, and let she/he push the ones he/she considers correct. Depending on the architecture of the system, we can send each answer one by one, or wait for a "submit" button to be pushed and process al the answers in a batch. Each button pressed should not be depressed in order to make the user thinks well her/his answer.
We asume you will provide all the different answers to show to the user per each question in order to include them in the apps.
We'll need to see/use the app to go further.
Please contact us if you have any question.
Regards,
Fernando Embrioni