[Kyoko Kirigiri]

It's not a guarantee, obviously, but there's no way they could have answered that quickly without absolutely knowing it. The roleplay earlier indicated that Chihiro knew Chihiro. Could the Acqui be a Danganronpa fan and also have known that, or have done some research on their acquisition? Sure. But had Chihiro NOT been able to answer, that would have been almost ironclad proof.