The Backslash is displayed in the answer tool-tip to students when it is used to escape a reserved character.
E.g. for a Cloze question:
{3:SA:=V+...+Adv\*]~V+...+Adv\*]}All that is needed is to entering
V+...+Adv*]
However, if answered incorrectly, the correct-answer tool-tip will display:
"The correct answer is: V+...+Adv*]"