The chicken, because the egg has proteins in it that only the chicken can produce. Just to throw a spanner into the works for you...
Not to mention that an egg can't incubate itself, a lone chick would be too weak to survive, and countless other logical arguments for why this "dilemma" is absolutely ridiculous.
I have a feeling this thread will get like 10 pages just because someone posted a pic of a calender and a funny message..