User answers are optional and can be disabled on a per-section or per-topic basis. A question may have an unlimited number of answers. Pro
To allow users to submit new questions from the front-end:
Go to Dashboard and click on "Configuration".
Under the Permissions tab, enable the Answer action for the user group that will be able to submit new answers.
Click on "Save & Close". The Post an answer button will now be visible inside questions for users that have permission to Answer questions.
Open the section and disable the parameter Question > Answers.
Open the topic and under the Permissions tab disable the Answer action for specific user groups.