one day Khunnalika send his servant ahamed to buy a chicken....
After sometimes he send hameed to buy eggs...
Hameed bought eggs in 5 mins.... and ahamed bought chicken in 10 mins...
So egg came first.....
It depends, do you believe in evolution and dinosaurs or God, if you believe in dinosaurs, they laid eggs before chickens were around (you didn't say chickens egg), if you believe in God, he made all the animals, so chickens came first.