Fine, that is about correct answers.
I think that the system should tell all the answers. In the screen shot above, how does the student know the answers to bus and cat?
Quiz is about evaluating and learning both so if a student is not able to answer or gives the wrong answer in both cases he/she should be told the correct answer unless teacher has other concerns. In my knowledge cloze multiple choice questions have similar problem in the sense that correct answer is not displayed for the question not attempted. On the other hand in matching type questions it looks like correct answer is not told for wrong attempt or for no attempt to a particular match.