Is it ok to lie to a kindergartener?

This is the question I presented to my principal today. I have so many kids in class who have the "hypochondriac". The slightest fall or bump seems to warrant an ice pack. On little girl told me this morning she needed one because she hurt her finger. When I went back a little bit later to look at it, she couldn't remember which hand it was. Then, this same girl "hurt" herself on the playground. I went to the office and asked the principal the above question. Her reply to me was that sometimes it's in the best interest to lie to the child, in cases like this. We agreed that as mother's we sometimes to the kids as well but it's for our own sanity that we have to do that. "No honey, the store isn't open today", "no, it's broken right now". Now I don't feel so bad for my little "lies" to my children because I do it for my sanity.