Canvas selfhost cannot add answer to quizzes using API

[haimeo1201]

Hi all, 

I have a Selfhost Canvas, and try to create quizzes using canvas api https://canvas.instructure.com/doc/api/quiz_questions.html#method.quizzes/quiz_questions.create

But i cannot add answer to this quizz, here is my postman, as you can see the answer array is empty in the response

Can someone help me? Thank you very much