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An answer that only uses facts you can prove, no lies or nonsense.
I told you the test was easy. I got 100% and you failed. That's a fact-based answer, you idiot.
He said he didn't cheat. I saw him with the answers. That's not fact-based, that's just stupid.
She said she didn't eat the whole cake. I found the crumbs in her hair. Fact-based? No. Fact-based? Hell no.