This documentation covers how Question Actions work.
Applications that support Question actions:
Questions allow you to ask users a question as an action. You can use this for feedback, surveys or to stimulate conversation.
You also have the option of validating answers. If you select Yes under Would you like to validate the answer? you will be able to define allowed repsonses and a maximum word count for your question. Users will not be able to submit answers which do not meet your requirements.
You can use letters, numbers, or Regex to set your allowed responses.
You can use this to feature to ensure users are correctly answering questions, choosing from a defined list of options, or staying under a set word limit.