Otus has the ability for teachers to enable students to check their answers on questions given on an Advanced Assessment.
The example below shows what this looks like when the student is taking the assessment:
Checking answers can be done in any question that will be auto-scored.
Step 1: While building the question, expand the More Options menu.
Step 2: Click the Check answer button checkbox.
Step 3: Determine how many times you'd like the students to be able to check their answers by typing a number into the Check answer attempts box.
On the student's side, the Check Answer button will become inactive once they've used all available attempts (see below)