App Advice

Hello I am looking for some advice for an App project. I want the app that asks a series of questions and based on the answers given further questions will be asked specific to the previous answers and eventually a diagnosis and final answer will be given. Is this possible and how simple is it to write the question section of this app as it is likely to change greatly as the app is built and tested? The front end will need to show the answer to each question. Regards