system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Where did all the materials come from during the big bang?

I'm utterly confused when it comes to the big bang.  What started it, what was before it, why it happened, how it happened.  I have read articles about it but they are way over my head.
gpt
This is literally the ultimate question of the universe. How did we get here? Nobody knows for sure and there is a possibility that we never will.

Basically, putting it straight, nobody knows.

Sorry if this comes across as unhelpful.