Using the Rich Text Editor in a Canvas Quiz answer

As of September 2017 when a teacher creates a Canvas Quiz and is inputting the answers to a question, the default is a simple text box.

HOWEVER, you CAN access the Rich Text Editor so that you can use the equation editor, font controls, graphics, etc. in a quiz answer. 

You need to click the small pencil icon at the right of a quiz answer dialog box to open up the Rich Text Editor.
Quiz answers with Rich Text Editor