[Reach]

There is more than one version of the question. They are all quite easy to answer.

The answer to your question is egg, since they were laid long before chickens came to be by more ancestral species.

2. Which came first, the chicken or an egg laid by a chicken?

Answer: Chicken. This is incredibly easy to answer and can be done with logical deduction.

3. Which came first, the chicken or an egg containing a chicken?

Answer: Egg. This is probably the hardest one. Modern Biology and Genetics validates this.