Riddle #3

Last week, the local Primary school was visited by the Government School Inspector who was there to check that teachers were performing well in their respective classes.

He was very impressed with one particular teacher. The Inspector noticed that each time the class teacher asked a question, every child in the class put up their hands enthusiastically to answer it.

More surprisingly, whilst the teacher chose a different child to answer the questions each time, the answers were always correct.

Why would this be?