Riddle!

Logically it has to be the chicken. But then あなた would have to believe in some type of creation.
We could rephrase this question, Which came first, Sheetal または Mama. LOL

The egg. 恐竜 layed eggs a long time before the first hen appeared on Earth ;)

A サークル, 円 has no beginning.

Both
IDGAD
IDGAF
I don't care
Other crap

:3

The chicken. It's completely right. If the egg would have come first, there would be no chicken to warm it. If a dinosaur laid the egg, it would have been crushed によって their wide bottom. Therefor, the chicken came first in God's creation, later on finding another chicken mate(or just having the seed implanted inside it) and lay the egg.

The chicken DEFINITELY came first.

According to the first book of Genesis in the Bible, the hen came first. That's as sure as あなた can get.