Hide correct answer in multiple choice

[dlashley]

I have tried suggestions and the correct answer continues to show in the multiple choice answers for students.  I have unchecked box to allow students to view answers and I do not allow students to have multiple attempts.  

I would like them to see that their answer is wrong and do over.  Yet, even when I take this away, the correct answer shows on the multiple choice.  The correct answer shows as another option... so students can determine the correct answer because it is a copy of another answer (whichever answer listed twice is the correct answer).