School psychologist coming into classroom

Hi we have a school psychologist coming into my classroom with her intern to observe students for IEP and the students are starting to get confused about who they are and what there doing . And they have started to make nicknames for them like spy teacher. How should respond to "who are they?" " what are they doing "? Also these are 5th graders so If you say none of your business. It will make them more curious about them.