* `showanswer` - When to show answer. For 'attempted', will show answer after first attempt. Values: never, attempted, answered, closed. Default: closed. Optional.
* `graded` - Whether this section will count towards the students grade. "true" or "false". Defaults to "false".
* `rerandomise` - Randomize question on each attempt. Values: 'always' (students see a different version of the problem after each attempt to solve it)
'onreset' (students see a different version of the problem when they reset, but are not forced to reset after each check)
'never' (all students see the same version of the problem)
'per_student' (individual students see the same version of the problem each time the look at it, but that version is different from what other students see)
