So, you have a school age child, they come home with a piece of homework, your child (and you) put a lot of effort into it. They come home the next day and tell you that their teacher told them it was wrong. You know it's not because you were with with them every step of the way.
Do you a)tell them that whatever the teacher says goes, and get over it?
b) back them up to the hilt, take evidence in to the teacher?
c) tell them they were right but there is nothing you can do?
For those of you who would go for b), once proven wrong would you expect the teacher to if not apologise to your child at least tell them she now knows they are correct? Or am I a moon man? Because I want to slap the teacher in question?