exerciseModelClassID|exercise2.choice.ChoiceExerciseModel submissionModelClassID|exercise2.choice.ChoiceSubmissionModel solutionModelClassID|exercise2.choice.ChoiceSolutionModel exerciseBodyClassID|exercise2.choice.ChoiceBody prompt|Should the missing table cell contain 'solid', or 'hatched'? type|0 numChoices|2 choice_0|Solid choice_1|Hatched answer_0|false answer_1|true