Teach the controversy?
What do you mean by controversy? That evolution is controversial to some of the public? Yes, clearly it is. That the theory of evolution is controversial among scientists who study it? No, it isn't. The general concept of evolution by natural selection is accepted science.
Creationism versus evolution is no more a controversy in modern science than is alchemy versus chemistry or astrology versus astronomy. Scientifically these debates were settled long ago.
There is no scientific controversy to teach.
[Images borrowed from: http://controversy.wearscience.com/]