When I was in elementary, my teacher said that “Lutetia” was how the Romans called the city of Liege. As an avid reader of Asterix comics, I knew this isn’t true and corrected her and said it was the Roman name of Paris. She insisted that it is Liege. Anyway, the next day, she came back to class and said that she looked it up and that I was indeed correct and Lutetia referred to Paris and gave me a chocolate bar and told me to keep reading comics. Good teacher.

I hope so much that this is ragebait. Because this is just obviously such bullshit.
The “correct” answer is just straight up wrong; it definitely is possible. If the kid was older, it might have to calculate how much bigger it is.

This is genuinely baffling. What was that teacher on.