What cereal is used to make oats?

It's a bit of a trick question! Oats are not made from a cereal. They are a cereal grain themselves.

Here's why:

* Cereal grains are a group of grasses that produce edible grains, like oats, wheat, rice, barley, etc.

* Oats are one specific type of cereal grain.

So, you wouldn't use another cereal to make oats. You would grow oats as a crop and then process them into various oat-based products like oatmeal, oat milk, and oat flour.