Check it in two minutes, without being an expert.

Verifying is not an investigation. Three steps are enough, and they take less time than you might think.

Step 1: Ask it for its sources, then open them

"What are you basing that on? Give me the sources."

Watch out for the trap, and it's a big one: it can invent a source, with a credible title and a link that leads nowhere. A cited source is therefore worthless until you've actually opened it. This step only makes sense if you click.

Step 2: Copy the sentence into a search engine

Take the precise claim, not the general topic. If no serious result echoes it, be wary. Two independent sources saying the same thing is already solid.

Step 3: Ask the question differently, in a NEW conversation

In the same conversation, it tends to stay consistent with what it just said. In a fresh conversation, if it gives a clearly different answer, that's a sign it doesn't actually know.

What doesn't work

Asking it "are you sure?" It will often say yes, or apologise and change its answer, without either being a clue to the truth. Its stated confidence measures nothing.